Question

Электрический утюг включен в сеть с напряжением 220 В на 1,5 часа. Каков расход электроэнергии, если сопротивление нагревательного элемента 100 Ом.

Answer 1

A=P*t=U^2*t/R=220^2*5400/100=2613600 Дж=0,726 кВт*ч

Answer 2

Calculation of Power Consumption

To calculate the power consumption of an electric iron, we need to use the formula:

Power (P) = (Voltage (V) ^ 2) / Resistance (R)

Given that the voltage is 220 V and the resistance of the heating element is 100 Ω, we can substitute these values into the formula:

P = (220^2) / 100

Let's calculate the power consumption using this formula.

Calculation

P = (220^2) / 100

P = 48400 / 100

P = 484 W

Therefore, the power consumption of the electric iron is 484 watts.

Please note that this calculation assumes that the resistance remains constant throughout the 1.5 hours of operation. In reality, the resistance of the heating element may change slightly due to temperature variations, which could affect the actual power consumption.