An industrial hydraulic pump consumes a total of 8.40×106 J8.40 \times 10^6\text{ J}8.40×106 J of electrical energy during a lifting cycle. Of this, 6.72×106 J6.72 \times 10^6\text{ J}6.72×106 J is usefully transferred as gravitational potential energy to the load.
Calculate the efficiency of this energy transfer to the load as a proportion.
The power rating of the hydraulic pump is 3.50 kW3.50\text{ kW}3.50 kW. Calculate the time taken for the pump to consume the total 8.40×106 J8.40 \times 10^6\text{ J}8.40×106 J of electrical energy. State the unit.
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.