Watt is equal to one

Substances that have constant resistance over a wide range of voltages are

A. ohmic

B. non ohmic

C. resistive

D. non resistive

A resistor having resistance 6.2Ω is connected across a battery of 5 V using a wire of negotiable resistance. Current passes through the resistor are 0.4 A. The total power produced by the battery is

A. 2 W

B. 3 W

C. 5 W

D. 6 W

As compare to short wires, long wires have

A. more resistance

B. no resistance

C. less resistance

D. same resistance

The device that disconnects the supply automatically if current exceeds the normal value is known as

A. circuit breaker

B. fuse

C. cable

D. capacitor

As per Ohm's law, V (potential difference) is equal to

A. I(current)×R(resistance of the conductors)

B. I(current)/R(resistance of the conductors)

C. R(resistance of the conductors)/I(current)

D. I(current) + R(resistance of the conductors)