Learning objective

Explain how a variable potential divider operates.

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Read the explanation.
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Cambridge IGCSE PhysicsElectricity and magnetismSupplement content

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Explain how a variable potential divider operates

This point belongs to Action and use of circuit components, especially Action and use of circuit components outcomes.
You need to be able to explain how a variable potential divider operates.
The key ideas to know are Describe and Explain.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeExplain

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This objective helps connect Action and use of circuit components outcomes to exam-style questions, flashcards, and revision notes for Action and use of circuit components.

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Paper 4 structured question: Action and use of circuit components

Paper 4Theory (Extended)1 marks

Description

Variable Potential Divider Description

A circuit consists of a fixed resistor of 1 kΩ and a variable resistor connected in series with a 12 V battery. The variable resistor can be adjusted from 0 Ω to 1 kΩ.

a
State the purpose of the variable resistor in this circuit.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Related learning objectives

Understand that the potential difference across a conductor increases with its resistance when the current remains constant.
Action and use of circuit components outcomes
Remember and apply the formula for two resistors functioning as a potential divider: R1/V1 = R2/V2.
Action and use of circuit components outcomes

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