100+ Electricity and Circuits Question Answers Pdf - 2

Question: 6

What is the law of charges?

Like charges repel and unlike charges attract.

Question: 7

What are the devices used to shutoff the electrical circuit?

Fuses, circuit breakers and safety switches have been designed to shut off electric circuit.

Question: 8

Define the electrochemical equivalent of a substance?

The electrochemical equivalent of a substance may be defined as the mass of the substance deposited at the electrode, when one ampere of current is passed through the electrolyte for one second.

Question: 9

Name the devices due to the magnetic effects of current?

Electromagnet, microphone are the devices due to the magnetic effects of a current.

Question: 10

What is electric resistance?

R = V/I

Electric resistance is defined as the ratio of potential differences to the current. The unit of resistance is ohm.