Heating Effects of Electric Current

Q.

Question 18

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 the wires as shown in the circuit given in Figure. The current flowing in both the circuits is the same.
(i) Will the heat produced in both the cases be equal? Explain.
(ii) Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.

Q.

Which of the following would have the highest resistance?

1. Short wire

2. Thin wire

3. A wire made of good conductors

4. Thick wire

Q.

Question 8 (c)
When current is switched ‘on’ in a room heater, it ___.

Q. An electric bulb in a closed circuit is not glowing. Which of the following can be a reason?

1. Bulb's filament is broken.
2. Filament of the bulb is made of Tungsten.
3. Switch in the circuit is on.
4. Wires are made of copper.

Q.

Question 14

Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used.

Q. Telephone wires are kept slightly loose when they are laid. Why?

Q.

A filament of a bulb becomes hot when an electric current is passed but connecting wires carrying current dont why?

Q.

Question 5
Name any two effects of electric current.

Q.

Write eg

Device were magnetic effects of current is used

Device were heating of current were used

Q.

Name the component that breaks the electric circuit in case of excess current.

1. Earth wire

2. Voltmeter

3. Fuse wire

4. Ammeter

Q.

(a) Name and explain any two effects of electric current.

(b) When current flows through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
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Q.

Which of the following wires made of same material will have higher resistance?

1. Thin wire

2. A wire made of good conductors

3. Thick wire

4. Short wire

Q.

Select the phenomena that depend on the heating effect of current:

1. Deflection of a needle

2. Glowing effect

3. Melting of a wire

4. Both B and C

Q. For a fuse rated at 10 A, the fuse melts if the current in the circuit exceeds A.

1. 5
2. 10
3. 1
4. 100

Q. 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 the wires as shown in the circuit A and B respectively. The current flowing in both the circuits is the same.
Will the heat produced in both the cases be equal? Explain.

Q. Match the terms in column I with those of column II.

Q. How does a fuse work. Can you please send me the answer fastly
in priyam.sarkarmsd@gmail.com.Because I have a test tomorrow.

Q. Name two electric devices where heating effect of current is used.

Q. fused bulb in a circuit does not glows. Why?

Q. Select the phenomenona that depends on heating effect of current.

1. Deflection of a needle
2. Glowing of an incandescent bulb
3. Melting of a wire
4. Working of a motor

Q.

Name the effect of electric current used in the heater.

Q. Fuse wire must have ___ melting point than the circuit wire.

1. equitable
2. higher
3. lower
4. None of the above

Q. In a bulb, electrical energy is converted into ___ and ___.

1. heat energy
2. kinetic energy
3. light energy
4. potential energy

Q. The heating element connected to 220 V draws a current of 4 A. Determine the amount of heat dissipated in 15 minutes. (J=4.2J/cal)

Q. What are the factors upon which the amount of heat produced in a wire depend?
(i) Material
(ii) Length
(iii) Thickness

1. Only (i) and (ii)
2. Only (i) and (iii)
3. (i), (ii) and (iii)
4. Only (ii) and (iii)

Q. ___ is used as a safety device to protect devices from large flow of current.

1. Bulb
2. Cell
3. Fuse
4. Battery

Q.

What are the applications in which magnetic effect of electricity works?

Q.

Which effect is utilized by an electric bulb?

1. Heating effect

2. Chemical effect

3. Power effect

4. Magnetic effect