Choose the statement which is not correct in the case of an electric fuse.

Which of the following precautions need not be taken while using electric gadgets/ appliances/circuit?

When a switch is in OFF position,
(i) circuit starting from the positive terminal of the cell stops at the switch
(ii) circuit is open
(iii) no current flows through it
(iv) current flows after sometime
Choose the combination of correct answer from the following.

Which depends only on the heating effect of current?

Our body is a_____________of electricity.

A combination of two or more cells is called a_____________.

Current does not flow in an____circuit.

CFLs consume more electricity than an ordinary bulb.

Electric fuse is based on the magnetic effect of electric current.

What do you mean by open circuit?

Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel in the night to get dim light. Has she taken the right step? Give one reason to justify your answer.

Draw in your notebook the symbols to represent the following components of electrical circuits : connecting wires, switch in the 'OFF' position, bulb, cell, switch in the 'ON' position and battery.

Why should we not touch the lighted bulb?

Can we use the same fuse in geyser and a television set? Explain.

One day Sohan went to his friend's house. He was surprised to see that most of the electrical appliances at his house were functional. For example tube light and fan in all rooms, two TV's, computer, light of toilet and kitchen were switched on Sohan told his friend that this is not the way to use electricity.
Now the question arises whether this habit of consuming electrical energy is acceptable or not. Why? 

Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Can we use the same fuse in a geyser and a television set? Explain.

If cells are placed side by side. Then, how are the terminals of the cells connected?

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.

Batteries used in tractors, trucks and inverters are also made from cells. Then why it is called a battery?

Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness both of them connected with wires as shown in the circuit given in figure. The current flowing in both the circuits is the same.
(a) Will the heat produced in both the cases be equal? Explain.
(b) Will the heat produced be the same, if the wires taken by them are of equal lengths but of different thickness? Explain.

Last Sunday, Pulpit was playing videotape in his room. While playing, the electricity of his house went off due to which he could not able to see anything around him. Then anyhow, he managed to get his mobile in his hand and with the help of its light, he went outside of his room to check if there was any problem in the electric circuit board of his house.
At the same time, his father suggested him to maintain the distance from the circuit board and decided to call some electrician to check the problem.
(a) Explain, what happens when live wire and neutral wire touches each other directly?
(b) State the values here showed by Pulkit's father.

Explain the working of electric bell with diagram