Calculate the cost of electrical energy at a rate of 2.8 rubles per 1 kWh consumed by an electric iron for 4 hours

univerkov | April 15, 2021 | education

Calculate the cost of electrical energy at a rate of 2.8 rubles per 1 kWh consumed by an electric iron for 4 hours of operation if it is connected to a 220V network with a current of 2.5A.

These tasks: tariff S = 2.8 rubles. for 1 kW * h; t (duration of operation of the electric iron) = 4 hours; U (mains voltage) = 220 V; I (current) = 2.5 A.

1) The power consumed by the taken electric iron: P = U * I = 220 * 2.5 = 550 W.

2) Electricity consumption: W = P * t = 550 * 4 = 2200 W * h = 2.2 kW * h.

3) The cost of electricity: TS = W * S = 2.2 * 2.8 = 6.16 rubles.

Answer: The cost of electricity will be 6.16 rubles.

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