Electricity, circuits and magnetism
Learn Electricity, circuits and magnetism for Year 9 pupils (ages 13–14). Free practice questions, lessons and worked examples — aligned to the UK National Curriculum.
What you'll learn
- 1
Current is the flow of charge. Potential difference is what pushes it. Resistance opposes it.
- 2
In a series circuit, current is the SAME everywhere and potential difference is shared. In parallel, each branch gets the full potential difference and current splits.
- 3
In a series circuit, what is true of the current?
- 4
A 12 V supply drives 3 A. What is the resistance?
- 5
Apply it: V = I × R. A 12 V supply through a 4 Ω resistor gives I = 12 ÷ 4 = 3 A. Add a second 4 Ω resistor in series and resistance doubles, so current halves to 1.5 A.
- 6
A 9 V supply across a 3 Ω resistor. What is the current?
- 7
Adding a second identical resistor in SERIES does what to the current?
Practise Electricity, circuits and magnetism with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 13–14. Aligned to the UK National Curriculum.