An electric heater uses 60 kJ of electrical energy in five minutes. What is the power rating of the heater?
720 kW
12 kW
1.2 kW
200 W
A small heater has a rating of 15V, 4A. How much energy does it consume if it is turned on for two minutes?
7.5 J
120 J
450 J
7200 J
Figure 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?
0.16 A
6.1 A
28 A
322 A
(b) How much electrical energy is consumed for one month (30 days), if the casserole is turned on for 2 hours everyday?
2.8 kJ
42 kJ
84 kJ
302 MJ
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