The resistance of a wire is R. If it is stretched to twice its length, the new resistance is:

Kirchhoff's junction rule is based on conservation of:

The internal resistance of an ideal ammeter is:

Three resistors of 3 Ω each in parallel. Equivalent resistance:

The EMF of a cell is measured by:

Drift velocity of electrons in a conductor is proportional to:

In a Wheatstone bridge, if P/Q = R/S, the galvanometer shows:

Power dissipated in a resistor R carrying current I is:

The resistivity of a semiconductor:

A cell of EMF 2V and internal resistance 0.5 Ω is connected to 1.5 Ω resistance. Current is:

The colour code for a 470 Ω resistor is:

Mobility of charge carriers is defined as:

Two cells of EMF 1V and 2V with internal resistances 1Ω and 2Ω in parallel. Equivalent EMF:

The temperature coefficient of resistance for metals is:

In a potentiometer, the potential gradient depends on:

Maximum power is delivered to load when load resistance equals:

Superconductors have resistance:

Electrical energy consumed by a 100 W bulb in 10 hours is:

The dimension of resistivity is:

A meter bridge is based on the principle of: