Analysing series circuits
I can use circuit rules and the equation I = V ÷ R to analyse series circuits.
Analysing series circuits
I can use circuit rules and the equation I = V ÷ R to analyse series circuits.
Lesson details
Key learning points
- Current can be calculated using the equation: current = p.d. ÷ resistance (I = V ÷ R).
- The rules of current and p.d. for a series circuit can be applied to find some missing values of current and p.d.
- The equation I = V ÷ R can be rearranged so that either V or R is the subject of the equation.
- If any two values in the equation I = V ÷ R are known, the third can be calculated.
- If only one value in the equation I = V ÷ R is known, rules for current or p.d. need to be applied to find a second.
Keywords
Electrical current - The amount of charge flowing past a given point in one second.
Series circuit - An electrical circuit with a single loop.
Potential difference (p.d.) - A measure of the push an electric field gives to charges.
Resistance - A property of a material that prevents the flow of current.
Ohms (Ω) - The unit of resistance.
Common misconception
To solve circuits, you need only to put numbers into equations.
Talk through circuits with pupils before analysing them in order to develop an intrinsic understanding of how circuits work; research shows this improves pupils’ problem solving ability for electric circuits.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
Exit quiz
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