SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CALCULATE THE ENERGY CONSUMED BY 120W TOASTER IN 20 MINUTE.
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44 KJ
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6KJ
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144 KJ
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122 KJ
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Explanation:
Detailed explanation-1: -120 W is 120 Joules per second, and 20Minutes is 1200 seconds. Hence the total energy consumed is 1200seconds*120W = 144000 Joules or 144 Kilo Joules.
Detailed explanation-2: -(i) P=1200 W. t= 30 min = 0.5 h. Electrial energy(E)= P x t. = 1200 x 0.5. = 600 W/h = 0.6 kWh. (ii) Energy consumed in 30 days. = 0.6 x 30 =18 kWh. Cost of using 18 unit = Rs. 4 x 18= Rs. 25-Sept-2018
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