Which of the following statements does NOT explain the meaning of the term ‘power’ in physics?The amount of energy transferred per secondThe rate at which work is doneThe rate at which energy is transferredThe total amount of energy which something has2An LED light bulb has a power rating of 6 W.  What does this mean?The bulb will use six ‘units of electricity’ per hourThe bulb will only light once six joules of energy have been transferred to itThe bulb must be connected to a 6 V power supplySix joules of energy are transferred to the bulb every second3An athlete runs up a flight of stairs in 10 seconds and 16 kJ of energy is transferred to their gravitational potential store.  Calculate their power output.  You may neglect all other energy transfers in answering this question.160,000 W160 W1600 W1.6 W4The output of a mobile phone charger is labelled ‘5 V, 1 A, 5 W’.  How much electrical energy will be supplied by the charger when it runs steadily for ten minutes?250 J50 J3 kJ15 kJ5A car of mass 2000 kg accelerates from rest to 20 m/s in 10 seconds.  Calculate the average power output of its engine.  In answering this question, you may assume that all of the energy which is supplied by the car’s engine is transferred to its kinetic store.40,000 W4,000 W4,000,000 W400,000 W6During a television programme, 180 kJ of energy was transferred to a 100 W television.  How long was the programme?1,800 seconds18,000 seconds546 seconds18 seconds