BRAINCAKEExam Style Question - 3
Question
A car battery has an e.m.f. of 12 V and an internal resistance of 0.020 Ω. When the starter motor is operated, the battery supplies a current of 150 A.
(a) Calculate the terminal potential difference while the starter motor runs.
(b) Calculate the power wasted in the battery and the power delivered to the motor.
(c) Explain why the headlights dim while the starter motor is running.
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Key terms in this lesson
- internal resistance
- The resistance inside a source of e.m.f., such as a cell or battery, which causes potential difference to be lost when current flows.
- terminal p.d.
- The potential difference across the terminals of a source when current flows, equal to its e.m.f. minus the volts lost across its internal resistance.
More in Electrical Circuits
- Electrical Work
- Electrical Power
- Power Dissipated By Resistors
- Efficiency
- Exam Style Question - 1
- Exam Style Question - 1
- Exam Style Question - 2
- Exam Style Question - 4
All 22 lessons in Electrical Circuits · All Edexcel AS-level Physics topics