Electricity

The resistivity of a wire depends on its:

When the temperature of a metallic conductor increases, its resistance usually:

In a parallel circuit, if one bulb blows out, the other bulbs will:

An ideal ammeter should have ________ resistance.

An ideal voltmeter should have ________ resistance.

Calculate the power of a motor that takes 5 Amperes from a 220V line.

Which of the following describes Faraday's law of electromagnetic induction?

In Fleming's Left Hand Rule, the middle finger represents the direction of:

What is the function of a commutator in a DC motor?

The EMF of a cell depends on:

If four cells each of 1.5V are connected in series, the total EMF is:

Why is the core of a transformer laminated?

If the cost of electricity is Rs. 10 per unit, how much does it cost to run a 2kW heater for 5 hours?

Which property of a wire is used in making the heating element of an electric kettle?

Two resistors of 6 Ohms and 12 Ohms are in parallel. What is their effective resistance?

What happens to the magnetic field strength of a solenoid if the number of turns per unit length is increased?

The unit of resistivity is:

Which of the following is used to convert an AC voltage into a different AC voltage level?

A wire of resistance 4 Ohms is stretched to double its length. What is its new resistance?

In a series circuit of three identical resistors, the total power dissipated is P. If they are reconnected in parallel to the same source, the total power will be: