A lamp is connected to the home circuit. The current passing through is 0.2A. How about the electric power of the lamp?

The voltage of household electricity is 220 v
So electric power P = UI = 220 * 0.2 = 44w

When the resistance of an electrical appliance is 30 ohm and the current passing through it is 0.2A, what is its actual electric power?

P=I^2*R=0.04*30=1.2W

If the voltage is 220 V and the current is 0 or 2a, how many watts of electric power will be consumed?

The electric power P = u * I, that is, the voltage depends on the current. So if the voltage is 220 V and the current is 0 and 2a, the electric power consumed is 220 * 0.2 = 44 W

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