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 (PPP), current (III), and potential difference (VVV).
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.
State the equation that relates efficiency, total power input, and useful power output.
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.
Practise AQA GCSE Physics Conservation and dissipation of energy with exam-style questions for Foundation and Higher tier. 29 questions covering Energy transfers in a system and Efficiency, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.