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Cambridge IGCSE Physics practice

Paper 4 structured question: Action and use of circuit components

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Action and use of circuit components

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Paper 4Theory (Extended)3 marks

Analyzing the output voltage of a variable potential divider.

Description

Output Voltage Calculation

In a variable potential divider with a fixed resistor of 2 kΩ and a variable resistor set to 2 kΩ, calculate the output voltage when connected to a 12 V supply.

  1. a

    Explain how to calculate the output voltage in this circuit.

    Aim for approximately 3 distinct marking points.

    [3]

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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.

  1. a

    State the purpose of the variable resistor in this circuit.

    Aim for approximately 1 distinct marking point.

    [1]