Applications of Joule's Heating

Q. Incandescent bulb works on the conversion of electricity to ________.

1. sound energy
2. mechanical energy
3. chemical energy
4. heat energy

Q.

What is electric current and it's affect in our life

Q. The device which works on the heating effect of electric current is:

1. Magnetic compass
2. Incandescent bulb
3. LED
4. Wire

Q.

An incandescent filament of an electric bulb emits light.

1. True
2. False

Q.

When an electric current flows through a copper wire AB as shown in the figure, the wire

Fig. \( 14.1 \)

Q.

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

1. Both the statements are true but statement 2 is not the correct explanation of statement 1.

2. Both the statements are true and statement 2 is the correct explanation of statement 1.

3. Statement 1 is correct and statement 2 is false.

4. Statement 1 is false and statement 2 is correct.

Q. Which gas is used in incandescent bulbs?

1. Oxygen
2. Nitrogen
3. Hydrogen
4. Sodium

Q. Name two effects produced by electric current.