Discussion
Determine the electric power consumed by an electric iron which is supplied with 240 V supply if the current drawn by the electric iron is 3A.
Answer: C
The power consumed by a resistive load such as an electric iron is the product of the voltage and the current, P = V x I.
\[ P = 240 \times 3 = 720\ \mathrm{W} \]
So the iron consumes 720 W, option (C), which is a reasonable rating for a small iron. The value 80 W is the voltage divided by the current, 240 W is the voltage alone, and 1120 W does not follow from the data given. A resistive appliance such as an iron takes the same power on AC as on DC at the same rms voltage, so the power factor is one and the simple product of volts and amperes can be used.
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