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Cambridge IGCSE Physics practice

Paper 4 structured question: Circuit diagrams and circuit components

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3

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Circuit diagrams and circuit components

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Paper 4Theory (Extended)3 marks

Analyzing the role of LEDs in circuits.

Description

LED in a Circuit

An LED is connected in series with a resistor and a power supply. When the circuit is closed, the LED lights up.

  1. a

    Explain why the LED lights up when the circuit is closed.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Circuit diagrams and circuit components

Paper 4Theory (Extended)1 marks

Description

Circuit Diagram with Diodes and LEDs

A circuit diagram includes a diode and an LED connected in series with a battery and a resistor. The diode is oriented to allow current to flow towards the LED.

  1. a

    State the function of the diode in the circuit.

    Aim for approximately 1 distinct marking point.

    [1]