Lights and bells

This task is about reading a circuit diagram.

Question

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What happens when the switch is open, as in the diagram?

    • The bulb is lit, but the bell does not ring.

    • The bulb is not lit and the bell does not ring

    • The bulb is lit and the bell rings.

    • The bell rings, but the bulb is not lit.

    • No current flows from the batteries.

Explain your answer.