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CIE iGCSE Co-Ordinated Science P4.2.5 Electrical energy and electrical power Exam Style Questions Paper 1

CIE iGCSE Co-Ordinated Science Paper 1 - All Chapters

Question

The diagram shows a circuit containing three cells, a variable resistor and an electric motor.

Which actions together must increase the speed of the motor?

A. decreasing the number of cells and decreasing the resistance of the variable resistor
B. decreasing the number of cells and increasing the resistance of the variable resistor
C. increasing the number of cells and decreasing the resistance of the variable resistor
D. increasing the number of cells and increasing the resistance of the variable resistor

▶️ Answer/Explanation
Increasing the number of cells increases the voltage (potential difference) across the motor, which increases the current flowing through it. Decreasing the resistance of the variable resistor also allows more current to flow. Since the speed of a motor increases with more current, both actions together will increase the motor’s speed. Therefore, option C is correct.
✅ Answer: (C)
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