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Question 15

An electric winch on a marine research vessel is used to deploy a deep-sea scientific instrument.

Write down the equation that relates electrical power ( $P$ ), current ( $I$ ), and potential difference ( $V$ ).

[1]

The electric winch motor operates at a potential difference of 240 V. When lifting the instrument, the electrical power supplied to the motor is 1.8 kW.

Calculate the current in the cable supplying the winch motor.

[2]

State the equation that relates efficiency, total power input, and useful power output.

[1]

During the lift, the winch motor itself receives a total electrical power input of 1500 W. The efficiency of this motor is 0.76.

Calculate the useful mechanical power output of the winch motor.

[2]

Markscheme

1 Energy Questions

GCSE
Physics
1 Energy

1 Energy

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Question 15

An electric winch on a marine research vessel is used to deploy a deep-sea scientific instrument.

Write down the equation that relates electrical power ( $P$ ), current ( $I$ ), and potential difference ( $V$ ).

[1]

The electric winch motor operates at a potential difference of 240 V. When lifting the instrument, the electrical power supplied to the motor is 1.8 kW.

Calculate the current in the cable supplying the winch motor.

[2]

State the equation that relates efficiency, total power input, and useful power output.

[1]

During the lift, the winch motor itself receives a total electrical power input of 1500 W. The efficiency of this motor is 0.76.

Calculate the useful mechanical power output of the winch motor.

[2]

Markscheme

1 Energy Questions

GCSE
Physics
1 Energy