Wire maintained at zero potential by connecting it to Earth at power station itself is called
Device that disconnects supply automatically if current exceeds normal value is known as
A resistor having resistance 6.2O is connected across a battery of 5 V by means of a wire of negotiable resistance. Current passes through resistor is 0.4 A. total power produced by battery is
If resistance of an electric bulb is 500 O and voltage across its ends is 250 V then power consumed by it is