BRAINCAKEExam Style Question - 1
Question
An electric motor is connected to a 12 V supply and draws a current of 2.5 A. It lifts a 3.0 kg mass at a steady speed through a height of 1.5 m in 4.0 s. (g = 9.81 N kg−1)
(a) Calculate the electrical power input to the motor.
(b) Calculate the charge that flows through the motor in 4.0 s.
(c) Calculate the efficiency of the motor.
(d) Suggest why the efficiency is less than 100%.
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Key terms in this lesson
- efficiency
- The ratio of useful energy or power output to the total energy or power input, often expressed as a percentage.
More in Electrical Circuits
- Electrical Work
- Electrical Power
- Power Dissipated By Resistors
- Efficiency
- Exam Style Question - 1
- Exam Style Question - 2
- Exam Style Question - 3
- Exam Style Question - 4
All 22 lessons in Electrical Circuits · All Edexcel AS-level Physics topics