O-LevelPhysicsElectricity5054/22 · Oct/Nov 2017 · Q84 Marks
In the engine compartment of a car, the battery supplies a current of 120A to the starter motor.
- (a)The starter motor is switched on for 3.5 s. Calculate the charge that passes through the starter motor in this time.[2]
- (b)The starter motor circuit is switched on and off using a relay. The relay is controlled using a second circuit. A switch in the second circuit is used by the driver to operate the relay and turn the starter motor on and off. Explain how the current in the second circuit controls the relay.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [C1] (Q =) It or 120 × 3.5
- [A1] 420 C
- [M1] (small current) magnetises something physical or produces a magnetic field or produces an electromagnet
- [A1] (terminals of motor) switch/contacts/terminals (in first circuit) attract/close
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