Heating Effect of Electricity

Q.

Why is fuse wire used in electric circuits?

1. To increase current flowing in the circuit.

2. For the protection of electrical appliances and circuit.

3. To increase the voltage.

4. To prevent insulation.

Q.

How much energy is transferred when $10A$ current flows through a resistor of $5ohm$ for $30$ minutes?

Q.

Which is the component that breaks the electric circuit in case of excess current?

1. Fuse wire

2. Voltmeter

3. Earth wire

4. Ammeter

Q.

Nichrome is used in electric heating appliances because, ___.

1. it has high resistivity

2. it has low melting point

3. it has low resistivity

4. it remains cool for long time

Q. Which of the following effects of electric current is made use of in the figure shown below?

1. All of the above.
2. Heating
3. Magnetic
4. Chemical

Q.

A heating coil has a resistance of $200\Omega$ . At what rate will heat be produced in it when a current of 2.5 A flows through it?

Q.

A bulb is rated at 230V- 100W. What is its resistance? Two such bulbs are switched-on for 4 hours continously. How much electrical energy is consumed by these two bulbs together?

1. $592\Omega ,1.44\times$ ${10}^{5}J$

2. $529\Omega ,1.44\times {10}^{4}J$

3. $529\Omega ,1.44\times {10}^{5}J$

4. $592k\Omega ,1.44\times {10}^{5}J$