A student in Trinidad is investigating a simple circuit. She notices that when more cells are added in series, the bulb glows brighter. Which statement best explains this observation?

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Question

A student in Trinidad is investigating a simple circuit. She notices that when more cells are added in series, the bulb glows brighter. Which statement best explains this observation?

Accepted Answer

Adding cells increases the potential difference across the bulb — Award 1 mark for understanding that cells in series provide greater total e.m.f., increasing p.d. across components and hence current and brightness. A is incorrect — cells do not significantly increase circuit resistance. C is incorrect — current increases, not decreases. D is incorrect — more cells supply more energy.

Answer

Adding cells decreases the current in the circuit

Answer

Adding cells reduces the energy in the circuit

Answer

Adding cells increases the potential difference across the bulb

Answer

Adding cells increases the resistance of the circuit

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