A circuit has a battery voltage of 20 V. A lamp resistance of 5 `Omega` is connected to the circuit. Calculate the current and the power of the circuit.

Explanation

`"Current" I = "Voltage" / "Resistance" = 20 / 5 = 4 A`.
Power P = Voltage `xx` Current `= 20 xx 4 = 80` watts.
The lamp gives out 150 W of power in the form of heat and light.

Or Power `P = I^2R = 4^2 xx 5 =16xx 5 = 80` watts

Or Power `P = V^2/R = 20^2/5 = 400 / 5 = 80` watts.