Page 26 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

Checkpoint-4

Question 1

What does it mean when we say a circuit is closed or open?

Question 2

Define the electric resistance of a wire and also write its SI unit.

Question 3

Keeping the potential difference constant, the resistance of a

circuit is halved. Then, how much does the current changes?

Question 4

What is the difference between a good conductor and a poor

conductor? Give two examples of each.

Question 5

Define the electric resistivity of a material and also write its SI unit.

Did you know?

1. The muscle cells in a human heart are contracted by
electricity that runs through your body.

2. A typical lightning bolt packs 100 million volts of electricity.

3. The first electric car was built in 1891 by American inventor

William Morrison.

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