Question

42. The power of an electric motor is 7.5 kilowatt. It was used for 15 days at the rate of 8 hours per day. how many units of electrical energy were consumed.

44. In a house 5 bulbs, rated as 220 V-100 W are used 8 hours daily. Find the expenditure for 30 days at the rate of 2 per unit.

45. Calculate the energy consumed in a 500 watt bulb in 8 hours in kilowatt-hour and joules.
Hint: 1 kilowatt-hour = 3.6 x 100 joules

46. The resistance of an electric heater is 20 ohms and its maximum power is 28.8 watts. Calculate the maximum current, that can flow in the heater safely.

47. A 25 watt bulb is connected to an electric mains of 200 volts. Calculate (i) the current flowing through the bulb and (ii) resistance of the bulb.

48. A 10 ampere fuse is connected to an electric circuit. How many 60 watt bulbs can be lighted simultaneously working of 240 voltage difference?

49. In a bulb 550 joules energy is consumed per second on passing a current of 0.55 ampere through it. Calculate the potential difference at the ends of the bulb.

50. In an electric heater 4.5 amperes current is flowing at 220 volts voltage. What is the power of the heater?
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Answer 1

Answer:

aree u serious.........

Explanation:

it iss too long