Heating Effect of Electric Current

Q. What is the working principle of an electric heater? On which factors does the amount of heat produced depends? [3 MARKS]

Q. On what factors does the amount of heat produced in a conducting wire depend and what is the working principle of an electric bulb? [3 MARKS]

Q.

Why electric heater have mirrors behind the heating coil?

Q.

(a) Why does electric current show heating effect?

(b) Name two appliances that work because of the heating effect of electric current?
[3 MARKS]

Q.

Selection of fuse is based on

1. steady load

2. Fluctuating

3. Both (A) and (B)

4. None of these

Q.

The heating effect of electric current works for both conductors as well as insulators.

1. True

2. False

Q. Heating effect of current depends upon the direction of current flow.

1. 50 m/s

2. 100 m/s

Q.

The amount of heat produced in a conductor does not depend on __________.

1. material

2. force

3. thickness

4. length

Q. Which of the following factor do not affect the heat generation in a current carrying wire.

1. Material of the wire
2. Length of the wire
3. Coating of the wire
4. Thickness of the wire

Q. Wires of copper and nichrome of same length are given as shown below. Which among these will produce maximum heat when connected to identical power supply?​
(Here A represents the cross-sectional area of the wires.)

1. 
   Wire P
2. 
   Wire Q
3. 
   Wire R
4. 
   Wire S

Q. Statement I: An electric bulb works on the principle of the heating effect of electric current.
Statement II: The electric bulb converts electrical energy to heat energy only.
Select the correct statement below.

1. Only statement I is correct.
2. Only statement II is correct.
3. Both the statements are incorrect.
4. Both the statements are correct.

Q. If nichrome has the heating effects of current then why is it not used in bulb as the filament?

Q. A distinct property of Nichrome because of which it is used as filament in incandescent bulbs is ____.

1. its low cost
2. its easy availability
3. its high resistance
4. its low melting point

Q. Two wires of equal length made up of the same material having different thickness carry equal amount of current. The amount of heat generated will be:

1. More in thicker wire
   
2. More in thinner wire
   
3. Equal in both wires
4. Zero in both wires
   

Q. The ............ the conductor, the more rapidly does heat transfer takes place.

1. better
2. worse
3. thinner
4. thicker

Q. What are the factors upon which the amount of heat produced in a current carrying wire depends?
1. Material of the wire
2. Length of the wire
3. Thickness of the wire

1. 1 and 2 only
2. 3 only
3. 2 and 3 only
4. 1, 2 and 3

Q. What are the factors upon which the amount of heat produced in a current carrying wire depends?
1. Material of the wire
2. Length of the wire
3. Thickness of the wire

1. 1 and 2 only
2. 3 only
3. 2 and 3 only
4. 1, 2 and 3

Q.

Electropositive elements tend to gain electrons.

1. True
2. False

Q. of an incandescent bulb gets heated up first.

1. Inert gas
2. Glass case
3. Filament

Q. The heat generated due to current is ____ when the length of the conductor is ____ and thickness of the conductor is ____.

1. less; less; more
2. more, less; more
3. less; more; less
4. more, more, more

Q.

How to make models based on heat and light

Q. Two wires of equal length made up of the same material having different thickness carry equal amount of current. The amount of heat generated will be:

1. More in thicker wire
   
2. More in thinner wire
   
3. Equal in both wires
4. Zero in both wires
   

Q.

I want to know about heating effect

Q.

Which wire has a red insulation in an electrical wiring?

1. Fuse wire

2. Live wire

3. Neutral wire

4. Earth wire