Quiz

Comprehension Questions: Power and Energy

Nursultan Zhakupov 4 perguntas

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Perguntas do quiz (4)

1An electric heater uses 60 kJ of electrical energy in five minutes. What is the power rating of the heater?
1. A720 kW
2. B12 kW
3. C1.2 kW
4. D200 W
2A small heater has a rating of 15V, 4A. How much energy does it consume if it is turned on for two minutes?
1. A7.5 J
2. B120 J
3. C450 J
4. D7200 J
3Figure shows the electrical information of an electrical appliance.
(a) What is the current generated if the casserole is turned on at normal operating voltage of 230V and a power of 1400 W?
1. A0.16 A
2. B6.1 A
3. C28 A
4. D322 A
4(b) How much electrical energy is consumed for one month (30 days), if the casserole is turned on for 2 hours everyday?
1. A2.8 kJ
2. B42 kJ
3. C84 kJ
4. D302 MJ