Science : Ch 12 – Electricity

Electrical resistivity of a given metallic wire depends upon:

A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is:

To get 2 Ω resistance using only 6 Ω resistors, the number of them required is

Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is

The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is:

The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?

Insulators consists of:

Electrical resistivity of a given metallic wire depends upon:

The commercial unit of electrical energy

S.I unit of resistance

S.I unit of resistivity

The rate at which electrical work is done or the rate at which electrical energy is consumed

Joule’s law of heating implies that heat produced in a resistor is directly proportional to the square of

At the time of short circuit, the electric current in the circuit

The maximum resistance which can be made using four resistors each of 2 Ohm