Heating Effect

Q.

Of the three connecting wires in a household circuit:

Which two of the three wires are at the same potential?

Q.

When electric current flows through a conductor, the conductor gets

1. hot

2. cold

3. displaced

4. broken into pieces

Q. Explain: Joules law of heating. (1 mark)

Q. Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:

1. $IR$
2. $I^{2}R$
3. $I^2{R}^{2}t$
4. $I^{2}Rt$

Q.

Manish had a habit of switching off the appliances if they were used for a long. His friends would, however, make fun of this habit of him. Without bothering about their remarks, Manish still stuck to his habits. On the basis of the above passage, answer the following questions
(1) Why did Manish switch off the appliances at regular intervals?
(2) Do you agree/justify Manishs act? Give reason.
(3) Compare and contrast the values of Manish and his friends.

Q. A wire with a green insulation is usually the live wire of an electric supply.

1. True
2. False

Q.

When the current in a conductor is doubled, keeping its resistance constant, the heat generated in the conductor will be:

1. double of the original

2. 4 times of the original

3. 3 times of the original

4. 8 times of the original

Q. Each electrical appliance is provided with a _______ core flexible cable. Fill in the blank.

1. 3
2. 2
3. 1
4. 4