Energy Transfers In A System (GCSE Physics)

A pavement tile produces 40 V and 4.4 W when stepped on. What current flows (A)?

A transmission cable has a power loss of 1.60 × 10^9 W and the current is 2000 A. What is the resistance of the cable (O)? (Use P = I^2 R)

Two identical bungee cords, each with spring constant 735 N/m and each extended by 8.0 m, store energy which lifts a 240 kg pod. What maximum height (m) will the pod reach? (g = 9.8 N/kg)

Calculate the gravitational potential energy gained (in kJ) by 100 kg of water pumped to 500 m (use g = 9.8 N/kg).

What energy (in kJ) is stored when 100 kg of water is heated by 80 °C? (Use specific heat capacity of water = 4.2 kJ/kg °C.)

Which equation links energy (E), power (P) and time (t)?

For the pumped-water method with 25% of stored energy wasted, what useful energy (in kJ) remains from 490 kJ?

A block of iron had energy 26 000 J added between 5 and 10 minutes. The block mass was 2.0 kg and the temperature rose by 20 °C in that interval. What is the specific heat capacity of iron (J/kg °C)?

Which energy store increases when water is pumped uphill into a reservoir?

A wind farm produces 696 MW which serves 580 000 homes. What is the mean power needed per home (W)?

What equation links work done (W), force (F) and distance moved in the direction of the force (s)?