Electricity is so woven into daily life that it can be easy to forget how remarkable it actually is. Every time a child flicks a light switch, charges a tablet, or watches a video at school, they are interacting with a force that scientists only began to understand properly in the 18th and 19th centuries. At LearningMole, we think the best way to spark curiosity about science is to start with the things children already know and work outward from there.
This article explains what electricity is, how it forms, and why it behaves the way it does, all in language that works for primary classrooms and kitchen-table conversations. It covers static electricity and current electricity, the basic science of circuits, the history of key discoveries, and a full set of safety and energy-saving tips. Whether you are a teacher planning a KS2 science unit or a parent helping with homework, you will find the core knowledge and practical guidance you need here.
Electricity sits firmly within the UK National Curriculum for science. Year 4 pupils study circuits, switches, and conductors; Year 6 extends this to voltage and the effects of changing circuit components. The content that follows is designed to serve both year groups, with clear explanations that teachers can adapt and parents can use at home.
Electricity is the flow of charged particles, usually electrons, through a material. Everything around us is made of atoms, and every atom contains a nucleus at its centre surrounded by electrons. In most materials, these electrons are held tightly in place. In conductors such as copper wire, however, electrons are loosely attached and can move freely from atom to atom. When something provides energy to push these electrons along a path, the result is an electric current.
A useful way to picture this for children: imagine the copper wire as a long pipe, and the electrons as tiny balls packed inside it. When you push from one end, a ball pops out of the other almost instantly. That is why turning on a light switch seems instantaneous, even though the electrons themselves move quite slowly. What travels at close to the speed of light is not the electrons but the electrical energy itself, passed from particle to particle along the conductor.
Volt measures the pressure driving the electrons. Ampere (amp) measures how many electrons pass a point per second. Watt measures the rate at which energy is transferred. These three units are the core vocabulary of electricity for KS2 science, and understanding what each one describes is more useful than simply memorising the definitions.
There are two distinct forms of electricity, and understanding the difference between them is a National Curriculum requirement at Key Stage 2. They behave differently, arise in different ways, and have different practical effects.
Static electricity is an electrical charge that builds up on the surface of an object rather than flowing through it. The word ‘static’ means stationary, which is exactly what the charge is: it sits in one place rather than moving along a path.
Static charges form through friction. When two surfaces rub against each other, electrons can transfer from one surface to the other. The surface that gains electrons ends up with a negative charge; the surface that loses them carries a positive charge. Opposite charges attract, which is why a balloon rubbed against a jumper sticks to a wall, or why your hair stands up when you pull off a woolly hat in winter.
Lightning is static electricity on a dramatic scale. As ice crystals and water droplets collide inside a storm cloud, enormous charge differences build up. When the difference becomes large enough, electrons jump through the air in a massive spark, which we see as lightning. A single lightning bolt can carry up to 1 billion volts.
Current electricity is what flows through wires and powers every electrical device in your home, school, and community. Unlike static electricity, current electricity moves continuously along a conductor in a closed loop called a circuit.
Current electricity comes in two forms. Direct current (DC) flows in one direction only. Batteries produce DC, which is why they have a positive and negative terminal: the electrons always travel from negative to positive through the circuit. Alternating current (AC) switches direction many times per second.
The mains supply in UK homes and schools is AC, alternating at 50 times per second (50 Hz). The reason power stations use AC rather than DC is that AC can be stepped up to high voltages for long-distance transmission and then stepped back down safely at the other end.
| Static Electricity | Current Electricity | |
|---|---|---|
| Movement | Stays in one place | Flows continuously |
| Source | Friction between surfaces | Battery or mains supply |
| Example | Balloon sticking to wall, lightning | Powering a light bulb, charging a phone |
| UK curriculum | Introduced in KS2 (Year 4+) | Circuits in Year 4; voltage in Year 6 |
| Voltage | Can be very high (lightning: up to 1 billion V) | Mains: 230 V; batteries: 1.5 V — 12 V |
A circuit is a complete, unbroken path through which electric current can flow. If the path has any gap in it, the current cannot flow, and the circuit is described as ‘open’. A complete, working circuit is called a ‘closed’ circuit. This is the fundamental principle behind every light switch: flicking it creates or breaks the path.
Every circuit needs four things. A power source (such as a battery or mains supply) provides the energy to push electrons around the loop. Conductors (wires, usually copper) form the path. A component (a bulb, buzzer, or motor) uses the electrical energy. A switch, when present, opens or closes the loop on demand.
In a series circuit, all components sit in a single loop. The same current flows through every component in sequence. If one component fails (for example, one bulb in a string of Christmas lights), the circuit breaks and all the others stop working too. The current does not vary around the loop, but adding more components reduces the amount of current reaching each one, which is why adding more bulbs in series makes them all dimmer.
In a parallel circuit, components are arranged in separate branches. Each branch has its own path back to the power source. This means each component receives the full voltage of the supply, and switching off one branch does not affect the others. Household wiring uses parallel circuits precisely because of this: turning off the kitchen light does not turn off the television. Each component in a parallel circuit draws its own current independently of the others.
Not all materials allow electrons to move freely. Conductors are materials where electrons can move easily; insulators are materials where they cannot. Understanding the difference is a key Year 4 and Year 5 practical skill in the National Curriculum.
| Good Conductors | Good Insulators |
|---|---|
| Copper (wiring) | Rubber (cable coating) |
| Aluminium (pans, foil) | Plastic (plug casings) |
| Iron and steel | Wood (dry) |
| Graphite (pencil lead) | Glass |
| Saltwater | Pure water (without impurities) |
Note on water: Pure water is actually a poor conductor. It is the dissolved minerals and salts in tap water, swimming pools, and the human body that conduct electricity. This is why electrical safety rules focus on keeping electrical devices away from water, not because water itself conducts, but because the impurities in it do.
Electricity was not discovered by a single person. It was understood gradually through a series of experiments spanning more than two centuries. A few figures are particularly relevant to the primary-level history of science.
William Gilbert (1544 — 1603) was one of the first scientists to study what he called ‘electricus’ (from the Latin word for amber, which holds static charge when rubbed). He distinguished electrical attraction from magnetism, laying the groundwork for later discoveries.
Benjamin Franklin (1706 — 1790) conducted his famous kite experiment in 1752 to test whether lightning was electrical in nature. He flew a kite in a thunderstorm with a metal key tied to the string; the charge conducted down the wet string to the key, confirming his hypothesis. This led directly to his invention of the lightning rod. It is worth noting with children that this experiment was extremely dangerous and should never be replicated.
Alessandro Volta (1745 — 1827) invented the voltaic pile in 1800, the world’s first battery capable of providing a continuous electrical current. The volt is named after him.
Michael Faraday (1791 — 1867) discovered electromagnetic induction, the principle that a moving magnet near a wire can generate an electric current. Almost all electricity generated by power stations today relies on this discovery.
Thomas Edison (1847 — 1931) built the first practical electrical power distribution system. His Pearl Street Station in New York began supplying electricity to customers in 1882.
The following 20 tips are grouped into three practical categories. The safety section is suitable for reading with children directly; the energy-saving and facts sections work well as discussion prompts in the classroom or at home.
Tip 1 — Never put fingers or objects into a socket. Mains electricity in the UK runs at 230 volts, which is enough to cause a fatal shock. Socket covers are not a substitute for supervision with young children.
Tip 2 — Keep electrical devices away from water. The minerals in tap water conduct electricity. Never use a hairdryer, phone charger, or any mains device near a sink, bath, or swimming pool.
Tip 3 — Never remove a plug by pulling the cord. This can damage the internal wires, creating a short circuit or exposed live wire. Always grip the plug itself.
Tip 4 — Replace frayed or damaged cables immediately. Worn insulation exposes live copper wire. A damaged kettle, toaster, or phone charger cable should be replaced, not taped over.
Tip 5 — Unplug appliances before cleaning them. Even when switched off at the wall, some devices retain charge. Unplugging ensures the circuit is completely broken.
Tip 6 — Never fly kites near power lines. A wet kite string can conduct electricity from an overhead cable directly to the person holding it. Open areas away from cables are the only safe place to fly kites.
Tip 7 — Never charge a phone under a pillow. Charging devices generate heat. Trapping that heat under a pillow or bedding can cause the battery to overheat, potentially starting a fire.
Tip 8 — Switch off at the wall, not just with the remote. Devices left on standby continue to draw power. A television on standby can consume 1 — 2 watts continuously; multiplied across every device in the home, this adds up over a year.
Tip 9 — Replace incandescent bulbs with LED alternatives. LED bulbs use around 75% less electricity than old-style incandescent bulbs and last approximately 25 times longer. The UK government phased out the sale of 60W halogen bulbs in 2021.
Tip 10 — Do not leave the refrigerator door open. Every second the door is open, warm air enters and the compressor has to work harder to restore the temperature. Deciding what you want before you open the fridge door is one of the simplest energy-saving habits to develop.
Tip 11 — Unplug chargers when devices are fully charged. Phone and tablet chargers draw a small current even when nothing is connected to them. Unplugging them when not in use costs nothing and reduces unnecessary energy use.
Tip 12 — Use a full load in the washing machine. A washing machine uses roughly the same amount of electricity whether it is half-full or completely full. Waiting for a full load before running a cycle roughly halves the energy used per item of clothing.
Tip 13 — Draw curtains in the evening to retain heat. Reducing heat loss through windows means the heating system runs less often, reducing the demand for electricity or gas. Thick curtains can reduce heat loss through a window by up to 15%.
Tip 14 — Use natural light where possible. Positioning desks and reading areas near windows reduces the need for artificial lighting during the day. Opening curtains or blinds fully on bright days is one of the most straightforward ways to reduce electricity use at home and in school.
Fact 15 — Electrical signals power your heartbeat. The heart’s natural pacemaker, a cluster of cells called the sinoatrial node, generates electrical impulses that trigger each heartbeat. This is what an electrocardiogram (ECG) measures.
Fact 16 — Electric eels generate electricity to hunt. Electric eels can produce discharges of up to 860 volts to stun prey and for navigation in murky water. They generate this electricity through specialised cells called electrocytes, which function like tiny biological batteries stacked in series.
Fact 17 — Lightning is five times hotter than the surface of the sun. A lightning bolt heats the surrounding air to approximately 30,000 Kelvin; the sun’s surface is about 5,778 Kelvin. This extreme heat causes the rapid expansion of air that we hear as thunder.
Fact 18 — The first lighthouse to use electric light was the Statue of Liberty. When it was unveiled in 1886, the Statue of Liberty served briefly as a lighthouse, with its torch lit by electric arc lamps. It was decommissioned as an official lighthouse in 1902.
Fact 19 — Electricity can be generated from animal waste. Biogas plants capture methane produced by decomposing organic matter, including animal manure, and burn it to generate electricity. This is an active area of renewable energy research and practice in UK agriculture.
Fact 20 — The human brain runs on about 20 watts. Despite accounting for only 2% of body weight, the brain consumes roughly 20% of the body’s total energy. The electrical signals it generates can be detected as brainwaves on an electroencephalogram (EEG).
This table gives approximate figures for typical UK household appliances, which can be used in classroom discussions about energy-saving choices.
| Appliance | Approximate Wattage | Comparison |
|---|---|---|
| Electric kettle | 2,000 — 3,000 W | Highest everyday use |
| Microwave | 800 — 1,200 W | High but brief use |
| Washing machine | 500 — 2,000 W | Varies by cycle |
| Television (LED) | 30 — 100 W | Lower than older models |
| Laptop computer | 20 — 50 W | Efficient for screen time |
| LED light bulb | 5 — 15 W | Far lower than incandescent |
| Phone charger (active) | 5 — 20 W | Small but often left plugged in |
| Tablet charger (standby) | 0.1 — 0.5 W | Adds up across many devices |
Electricity is explicitly covered in the KS2 science programme of study. Understanding where each concept sits in the curriculum helps teachers plan sequences of lessons and helps parents know what their children are expected to cover.
| Year | Programme of Study | Key Concepts |
|---|---|---|
| Year 4 | Electricity (statutory) | Simple circuits, switches, conductors and insulators, identifying common appliances that run on electricity |
| Year 6 | Electricity (statutory) | Circuit diagrams using symbols, changing voltage, the effect of changing wire length/thickness/material on brightness and speed |
Working Scientifically objectives also apply across both year groups. Children should be able to design fair tests to compare conductors, predict outcomes before testing, record results in tables, and draw evidence-based conclusions. For Year 6, this extends to using results to suggest improvements and raise further questions.
“Electricity is one of the most satisfying topics to teach in KS2 because children can test their predictions immediately. Building a circuit that actually lights a bulb is a moment of genuine scientific discovery for most seven and eight-year-olds. That moment of ‘I made that happen’ is where real scientific thinking begins.” — Michelle Connolly, Founder of LearningMole and former teacher with over 15 years of classroom experience
Understanding where electricity comes from connects the KS2 curriculum to broader topics of sustainability, climate, and energy that children will encounter throughout their education.
Most electricity generation relies on Michael Faraday’s discovery of electromagnetic induction: a moving magnetic field induces a current in a conductor. Power stations of all types use this principle; what varies is the energy source that drives the magnets.
Fossil fuel power stations (coal, natural gas, oil) burn fuel to heat water, producing steam that drives turbines connected to generators. In 2024, natural gas remained the UK’s largest single source of electricity generation, though its share has been declining year on year as renewable capacity has expanded. Nuclear power stations use heat from nuclear fission rather than combustion, but the generator principle is identical.
Renewable energy sources do not run out and typically produce far fewer emissions. Wind turbines convert the kinetic energy of wind directly into electricity without steam. Solar panels (photovoltaic cells) convert light directly into electrical current through the photoelectric effect.
Hydroelectric power, which currently generates roughly 71% of all renewable electricity worldwide, uses falling water to spin turbines. Tidal power harnesses the movement of ocean tides. The UK has invested significantly in offshore wind, and the sector now generates a substantial proportion of national electricity.
| Source | How it works | Renewable? |
|---|---|---|
| Natural gas | Combustion heats steam, drives turbines | No |
| Nuclear | Fission heat drives steam turbines | Debated (low carbon) |
| Wind | Turbine blades spin generator directly | Yes |
| Solar (PV) | Photovoltaic cells convert light to current | Yes |
| Hydroelectric | Falling water spins turbines | Yes |
| Tidal | Tidal flow drives underwater turbines | Yes |
| Biogas | Methane from organic waste powers generators | Yes (from waste) |
The practical nature of electricity makes it one of the most teachable topics in KS2 science. Children can build real circuits, test predictions, and see immediate results, which builds both scientific skills and genuine enthusiasm for the subject.
LearningMole’s curriculum-aligned science videos explain electrical concepts with animated demonstrations that are difficult to replicate with still images. The circuit’s content covers component identification, series and parallel circuit construction, and the effect of changing circuit components, all presented at a pace suited to primary learners. Teachers have used these videos as lesson starters, mid-lesson checks, and home-learning consolidation tasks.
For teachers looking to download circuit diagrams, conductor-and-insulator sorting activities, or electricity fact sheets, LearningMole’s resource library includes printable materials aligned to the Year 4 and Year 6 programmes of study.
Parents do not need specialist equipment to support electricity learning at home. A simple battery, a length of wire, a small bulb or LED, and a few household items are enough to run the same conductor-testing experiments children do in school. The key questions to explore together are: Does the bulb light? What materials keep it lit? What breaks the circuit?
LearningMole’s educational videos work well for home use because they repeat key vocabulary, show processes visually, and are paced for children rather than adults. Parents can watch alongside their child and pause to discuss what they are seeing, which significantly increases retention compared to passive viewing.
Electricity is a form of energy created by the movement of tiny charged particles called electrons. In most everyday situations, these electrons travel through metal wires, which act as a path. When electrons move around a complete loop called a circuit, they can power devices such as bulbs, buzzers, and motors. The simplest way to show this to a child is to build a circuit with a battery, two wires, and a small bulb: when the wires are connected, the bulb lights; when one wire is disconnected, it goes out. This makes the invisible visible.
There are two main types: static electricity and current electricity. Static electricity is an electrical charge that builds up on a surface due to friction, such as when you rub a balloon on your hair. It does not flow continuously. Electric current is the continuous flow of electrons through a conductor, which powers all electrical devices. Current electricity is further divided into direct current (DC), produced by batteries, and alternating current (AC), supplied by the mains. UK mains electricity is AC at 230 volts and 50 Hz.
Electricity is covered in two key stages in the UK National Curriculum. Year 4 pupils (ages 8 to 9) study simple circuits, identifying and naming components, understanding what makes a circuit work, and investigating conductors and insulators. Year 6 pupils (ages 10 to 11) extend this to circuit diagrams using standard symbols, the effect of voltage on circuits, and how changing circuit components affects what happens. Both year groups develop Working Scientifically skills through practical investigation.
In a series circuit, all components are connected in a single loop. The same current passes through each component in turn. If one component stops working, the entire circuit breaks. In a parallel circuit, components are on separate branches that each connect independently to the power source. Each component receives the full voltage, and switching off one branch does not affect the others. Household wiring uses parallel circuits so that different rooms can be controlled independently. A series circuit is easier to build and understand, which is why it is introduced first in Year 4.
Pure water is actually a poor conductor of electricity. What makes water dangerous around electrical equipment is the dissolved minerals and salts it contains, which carry an electrical charge effectively. Tap water, rainwater, seawater, and swimming pool water all conduct electricity due to these impurities. The human body is roughly 60% water with dissolved salts, which is why electric shocks through the body are so dangerous. This distinction (pure water vs. water with impurities) is a useful discussion point in KS2 science.
The best home support is practical. A simple battery-and-bulb circuit kit allows children to replicate school experiments at home. Sorting household objects into ‘conductor’ and ‘insulator’ piles and then testing predictions with the circuit is a straightforward activity that reinforces Year 4 content. LearningMole’s science videos work well alongside this, providing explanations children can watch before or after the practical activity. Parents do not need to be science specialists: asking ‘What do you think will happen?’ and ‘Why do you think that happened?’ is the most valuable thing they can do.
The most important rules are: never put fingers or objects into a socket; keep all electrical devices away from water; never use damaged cables; always remove a plug by gripping the plug, not the cord; and never charge a device under a pillow or in bed. For outdoor safety: never fly kites near power lines; never climb near electrical substations; and never touch fallen or damaged cables. The key principle children should understand is that mains electricity (230 volts) is powerful enough to kill, while the low-voltage electricity in batteries (1.5 to 12 volts) used in classroom experiments is safe for supervised educational use.
Practical circuit-building is the most effective approach for Year 4, using batteries, bulbs, wires, and a selection of materials for conductor-insulator testing. Circuit diagram work and structured investigations are better suited to Year 6, when pupils can also explore the relationship between voltage and brightness. LearningMole’s curriculum-aligned electricity videos provide clear animated explanations that work well as lesson starters, consolidation tasks, or home learning support. The videos cover circuit construction, safety, types of electricity, and renewable energy, all aligned with the National Curriculum programmes of study for Year 4 and Year 6.
Electricity is not an abstract scientific concept but a natural force at work in everything from thunderstorms to heartbeats, and understanding it changes the way children see the world around them. The journey from William Gilbert’s experiments with amber to the offshore wind farms powering UK homes today spans less than five centuries, which in scientific terms is remarkably recent. Teaching children that knowledge grows through evidence, experiment, and revision is as valuable as the content itself.
The 20 tips in this article are intended to be genuinely useful rather than exhaustive. Safety knowledge matters most: a child who understands why water and electricity are a dangerous combination is better equipped than one who has simply been told ‘don’t mix them’. The energy-saving tips connect scientific understanding to practical choices that children can influence at home right now. And the facts section exists to remind both teachers and learners that electricity is, at its core, astonishing.
LearningMole’s science resources support teachers and parents in making electricity come alive in the classroom and at home. From animated circuit explainers to printable resources aligned with the Year 4 and Year 6 programmes of study, the materials are designed by educators who have taught this topic and know where children get stuck. Explore the full library and find the resources that work for your learners.
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