How much is the energy consumed by a 120 W TV for 3 hours of operation (tariff is 4 tenge per 1 kW * h)
| March 12, 2021 | education
1) Since the electricity tariff is set in kWh, we will translate the power of the TV into kW:
P = 120 [W] = 0.12 [kW]
2) Let’s find how much electricity was consumed in t = 3h:
Q = P * t = 0.12 [kW] * 3 [h] = 0.36 [kW * h]
3) Let’s find how much this electricity costs:
0.36 [kW * h] * 4 [tenge] = 1.44 [tenge]
Answer. The cost of electricity is 1.44 tenge.
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