1.7.4

Power

2 flashcards to master Power

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Key Concept Flip

An electric motor lifts a 2.0 kg mass vertically by 0.50 m in 1.0 s at a constant speed. Calculate the power output of the motor.

Answer Flip

Power = Work Done / Time
Work Done = Force x Distance = Weight x Distance
Weight = mass x g = 2.0 kg x 9.8 N/kg = 19.6 N
Work Done = 19.6 N x 0.50 m = 9.8 J
Power = 9.8 J / 1.0 s = 9.8 W

Therefore, the power output of the motor is 9.8 Watts. Power is the rate at which work is done.

Key Concept Flip

A light bulb is rated at 60 W. State what this means in terms of energy transfer.

Answer Flip

A 60W light bulb transfers 60 Joules of electrical energy to light and heat energy every second. Power is the rate of energy transfer, so a higher wattage means more energy is transferred per second.

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1.7.3 Energy resources 1.8 Pressure

About Power (1.7.4)

These 2 flashcards cover everything you need to know about Power for your Cambridge IGCSE Physics (0625) exam. Each card is designed based on the official syllabus requirements.

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