Year 6 Science: Electricity, Circuits and Light for KS2

Year 6 is an important time for building confidence in science. As children approach the end of Key Stage 2, they revisit ideas from earlier years and learn to explain them with greater precision. Electricity and light are especially useful topics for practical investigation: pupils can make predictions, test them safely and use evidence to explain what they observe. A little structured practice at home or in the classroom can help children remember key vocabulary and prepare for the move to secondary science.

What the National Curriculum expects

In England, the Year 6 programme of study for science includes electricity and light. For electricity, pupils should associate the brightness of a lamp or the volume of a buzzer with the number and voltage of cells used in a circuit. They should compare and give reasons for variations in how components function, including the brightness of bulbs, the loudness of buzzers and the operation of switches. They should also use recognised symbols when representing a simple circuit in a diagram.

For light, pupils should recognise that light appears to travel in straight lines. They learn that objects are seen because light travels from a source to our eyes, or from a light source to an object and then into our eyes. They should use this model to explain why shadows have the same shape as the objects that cast them, and consider how the apparent size of a shadow changes when the distance between the light source, object and surface changes. These are statutory curriculum expectations, not simply extra topics for keen scientists.

Electricity: understanding a complete circuit

A useful starting point is the idea of a complete circuit. A cell provides electrical energy, and a continuous conducting path allows the components to work. If there is a gap, such as an open switch or a disconnected wire, the circuit is incomplete and the bulb will not light or the buzzer will not sound. Ask your child to trace the path around a circuit diagram with a finger and identify where the gap is. This simple habit helps them reason from a diagram instead of guessing.

Children should become familiar with components such as cells, lamps, switches, buzzers and wires, as well as the standard symbols used to draw them. Encourage them to distinguish a circuit diagram from a picture of a real circuit: diagrams use agreed symbols to communicate clearly, rather than showing components exactly as they look. Short worksheet activities that ask pupils to match symbols to components, spot an error or complete a circuit can reinforce this knowledge before they tackle more complicated investigations.

Investigating cells and components

In Year 6, pupils move beyond simply making a bulb light. They explore how changing the number or voltage of cells can affect a lamp or buzzer. A strong investigation changes one factor at a time. For example, pupils might compare the brightness of the same lamp using different numbers of identical cells, keeping the wires, lamp and circuit arrangement the same. They can record what they notice in a table and explain whether the evidence supports their prediction.

Help children make observations carefully. “The bulb is brighter” is more useful than “the circuit is better”, because it describes the result being measured. They can compare results using a consistent scale, such as dim, medium and bright, while recognising that this is less precise than a measuring instrument. Ask what was kept the same and what changed. These questions build the fair-testing habits expected across the primary science curriculum.

Safety matters whenever children handle electrical components. Use only low-voltage cells or batteries designed for classroom experiments, and never connect a circuit to mains electricity. Check equipment for damage, keep components dry and follow the school’s or kit manufacturer’s guidance. Adult supervision is sensible, particularly when younger siblings are nearby. If a bulb does not light, encourage a calm check of the connections and switch rather than repeatedly changing several parts at once.

Light, vision and shadows

Children often say that we see an object because our eyes send something out towards it. Year 6 science corrects this idea: light travels from a source, such as the Sun or a lamp, and enters our eyes either directly or after reflecting off an object. A torch shining on a book in a darkened room provides a simple demonstration. The book becomes visible when light from the torch reaches it and then reflects towards the observer.

The straight-line model of light helps explain shadows. An opaque object blocks light, creating a darker area behind it. Pupils can investigate this with a torch, a small object and a screen or sheet of paper. Move the object closer to the light source and observe how the shadow changes; then move it closer to the screen. Encourage children to describe the arrangement precisely, including which distance changed and what happened to the shadow. The same shape is formed because the object blocks light along straight paths, though the size can vary with the positions of the source, object and screen.

A safe, low-cost investigation can use a torch indoors, with the room lights dimmed if appropriate. Do not look directly at the Sun or shine bright lights into anyone’s eyes. Children can draw the setup and label the light source, object, screen and shadow. This combines scientific understanding with clear communication, another important part of primary science.

Building confident scientific explanations

At this age, pupils benefit from moving beyond naming facts to explaining why something happens. Prompt them to use words such as cell, component, complete circuit, voltage, light source, reflection, opaque and shadow. A useful explanation might link cause and effect: “The switch is open, so there is a gap in the circuit and the lamp does not light.” For light, a child might explain that “the object blocks light travelling from the torch, so a shadow forms on the screen.”

Talk through everyday examples. Why does a bicycle light stop working when its batteries are flat? Why does a shadow shift as the Sun appears to move across the sky? What might happen to a shadow if a toy is moved nearer to a lamp? These questions invite children to apply their knowledge without turning every conversation into a test. Give them time to suggest an idea, then ask what observation could help check it.

Making practice and revision effective

Brief, regular practice is often more useful than a long session just before an assessment. A few minutes spent drawing a circuit from memory, labelling its components or explaining a shadow can help key ideas stick. Worksheets can provide focused revision through circuit-symbol matching, prediction questions, vocabulary tasks and opportunities to interpret results. Choose activities that ask children to explain their reasoning, not only select a correct answer.

When reviewing work, treat errors as clues about what needs another demonstration. A pupil who draws a bulb connected by a wire to only one end of a cell may need to revisit the idea of a complete path. A child who thinks eyes emit light may benefit from tracing the route from torch to object to eye. Encourage corrections in a different colour and ask the child to explain what they changed. This makes revision active and helps teachers and parents identify progress.

A practical way forward

Year 6 science is about curiosity as well as remembering facts. Give children safe opportunities to build simple circuits, compare results and investigate shadows, while encouraging them to draw, record and explain what they observe. Link practical work to the National Curriculum expectations, revisit important vocabulary and use short worksheets for purposeful practice and revision. With patient questioning and regular opportunities to test ideas, pupils can finish Key Stage 2 ready to approach electricity and light with confidence.