Mains Electricity, Power and the Cost of Electricity — Interactive Lesson (Ages 14–16)

Why does a plug have three wires, and how is the number of units on an electricity meter worked out? This 22-slide interactive lesson on mains electricity takes pupils from first ideas to exam-style explanations, with 13 self-marking activities and nothing to prepare beforehand.

Teaching Mains Electricity, Power and the Cost of Electricity in GCSE Physics

Pupils compare a.c. and d.c., describe the live, neutral and earth wires and how the earth wire and fuse protect users, and calculate power with P = V × I and energy with E = P × t. They work out energy use in kilowatt-hours and its cost, and explain why the National Grid uses step-up and step-down transformers.

What Pupils Will Learn

• 〰 Compare alternating current and direct current.
• Describe the live, neutral and earth wires and how they keep you safe.
• Calculate power using P = V × I and energy using E = P × t.
• Calculate energy use in kilowatt-hours and its cost.
• Explain why the National Grid uses high potential differences.

What’s Included

• 22-slide interactive lesson on mains electricity
• 13 self-marking activities: multiple-choice questions, true-or-false checks, sorting tasks, drag-and-drop categorising and fill-in-the-gap questions
• Step-by-step teaching cards that reveal one point at a time
• A written explanation task with a model answer for self-assessment

Why Teachers Love It

• No prep — open it on an interactive whiteboard, laptop or tablet
• Instant feedback explains every answer, right or wrong
• Everyday examples make physics feel real
• Works for whole-class teaching, independent study or revision

Curriculum Alignment

Supports UK GCSE Physics and Combined Science (AQA, Edexcel and OCR) and the Nigerian Senior Secondary Physics curriculum (SS2), including WAEC and NECO exam preparation.

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FAQ

What year groups is this for? Years 10–11 (ages 14–16), and SS2 in Nigeria.

Is it self-marking? Yes — all 13 activities give instant feedback.

Do pupils need to log in? No. The lesson runs in any modern web browser.

Can I use it for revision? Yes. Pupils can replay it as often as they like, and the results screen shows which questions to review before a test.