Series and Parallel Circuits
In a series circuit components are in one loop sharing the same current, while in a parallel circuit they are on separate branches sharing the same voltage.
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In a series circuit components are in one loop sharing the same current, while in a parallel circuit they are on separate branches sharing the same voltage.
- Series: same current everywhere
- Parallel: same voltage across branches
- Parallel circuits keep working if one branch breaks
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Series and Parallel Circuits?
Within Physics, which covers forces, energy, waves, electricity, magnetism, light and space explained through motion and experiments, this topic explains Series and Parallel Circuits. Physics topics explain how things move, push, heat up and carry energy, so each one here pairs a definition with a live model you can change.
Check that you can explain Series and Parallel Circuits in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Series and Parallel Circuits explains how the physical world behaves, from sport and transport to electricity and medicine.
Series and Parallel Circuits in detail
In a series circuit, components are connected in a single loop. The current is the same through each, the p.d.s add to the supply voltage and the total resistance is the sum of the individual resistances. If one component fails, the whole circuit breaks.
In a parallel circuit, components are on separate branches. The p.d. across each branch equals the supply, the currents in the branches add to the total current, and the total resistance is smaller than any single branch. If one branch fails, the others keep working, which is why household circuits are parallel.
How the interactive helps you understand Series and Parallel Circuits
Watch the circuit in the interactive. Use any sliders or buttons it offers to change the values and see how the circuit responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Series and Parallel Circuits.
Real-life uses and examples
- Predict what a ball, car or circuit will do with Series and Parallel Circuits before you do the calculation.
- Explain everyday devices, such as brakes, lifts or chargers, using Series and Parallel Circuits.
- Use Series and Parallel Circuits to make sense of a practical and its results.
Common mistakes to avoid
- Mixing up Series and Parallel Circuits with a related quantity that has different units.
- Forgetting that some quantities, such as force or velocity, also have a direction.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Series and Parallel Circuits
What is Series and Parallel Circuits?
In a series circuit components are in one loop sharing the same current, while in a parallel circuit they are on separate branches sharing the same voltage.
What are the most important points about Series and Parallel Circuits?
The main points are: Series: same current everywhere; Parallel: same voltage across branches; Parallel circuits keep working if one branch breaks.
Why is Series and Parallel Circuits useful?
Understanding Series and Parallel Circuits explains how the physical world behaves, from sport and transport to electricity and medicine.
How can I practise Series and Parallel Circuits?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Series and Parallel Circuits?
Related topics in Physics include Mains Electricity and Safety, The Motor Effect, Transformers.