Efficiency and energy resources

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Question 30
Easy

An electric winch motor is used to lift heavy building materials on a construction site.

An energy transfer diagram for an electric winch motor. A wide horizontal arrow representing the input energy splits into two branches. The main input arrow on the left represents 'Electrical energy supplied' and is labeled '2500 J per second'. The straight, upper branch representing 'Useful gravitational potential energy to lift the materials' is labeled '1800 J per second'. The lower curved branch representing 'Wasted thermal energy transferred to the surroundings' is labeled '700 J per second'.

Calculate the efficiency of the winch motor.

Use the equation:

efficiency=useful energy transferred by the motor in one secondtotal energy supplied to the motor in one second \text{efficiency} = \frac{\text{useful energy transferred by the motor in one second}}{\text{total energy supplied to the motor in one second}} efficiency=total energy supplied to the motor in one seconduseful energy transferred by the motor in one second​
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Efficiency and energy resources Questions

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