Question

power developed
16. What kind of energy transformations take place at a hydroelectric power station ?
19. What kind of energy transformations take place at a coal-based thermal power station ?
weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the
power?
21. The power output of an engine is 3 kW. How much work does the engine do in 20 7
22. An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating
23. How much electrical energy in joules does a 100 watt lamp consume
(a) in 1 second ?
(b) in 1 minute ?
24. Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt
hours,
25. Describe the energy changes which take place in a radio,
26. Write the energy transformations which take place in an electric bulb (or electric lamp).
27. Name five appliances or machines which use an electric motor.
28. A bulb lights up when connected to a battery. State the energy change which takes place:
(i) in the battery (ii) in the bulb.
29. The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings
towards centre position A and then to the other extreme position C. In which position does the bob have:
(i) maximum potential energy ?
(ii) maximum kinetic energy ?
Give reasons for your answer.
30. A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m in 100 s.
Calculate :
(a) work done by the car.
(b) power of engine of car.​

Answer 1

Answer:

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Explanation:

Answer 2

Answer:

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