Applications of Thermoelectricity

Q. Why does the bulb glow brighter when it is powered by two cells rather than one?

1. The flow of electricity in the circuit is less.
2. The flow of electricity in the circuit is the same.
3. The flow of electricity fluctuates.
4. The flow of electricity in the circuit is greater.

Q. Why does the bulb glow brighter when it is powered by two cells in series rather than one?

1. The flow of electricity in the circuit is less.
2. The flow of electricity in the circuit is same.
3. The flow of electricity in the circuit is greater.
4. The flow of electricity fluctuates.

Q. Which of the following does NOT contain a heating element?

1. Electric iron
2. Electric heater
3. Electric oven
4. Electric bell

Q. Electric iron/press, used for pressing clothes, works on effect of electric current.

1. overloading
2. heating
3. magnetic
4. chemical

Q.

Electromagnets are used in loudspeakers, electric bells and _______.

Q.

Electric bell is an example of an electromagnet.

1. Bar magnet

2. Cylindrical magnet

Q. Which of the following devices converts electrical energy into heat energy?

1. A dynamo
2. An electric iron
3. A loud speaker
4. A thermocouple

Q.

The heating element of an electric stove offers some _________ for the flow of the current through it.

Q.

explore and elaborate on the advantages and disadvantages of the heating effect of electric current

Q. Which of the following devices does not work on the principle of heating effect of current?

1. 
   Room Heater
2. 
   Incandescent Bulb
3. 
   Ceiling Fan
4. 
   Electric Iron

Q. Which of the following does NOT contain a heating element?

1. Electric iron
2. Electric heater
3. Electric oven
4. Electric bell

Q.

Listed below are the uses of magnets and electromagnets. indicate whether a permanent magnet for Electromagnet is used in each of the cases with an explanation.

Loudspeaker

Q. The electricity consumed in a regular lamp is ____ as compared to that of an LED.

1. more
2. less
3. half
4. equal

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

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

Q. The electrical energy used in households, industries and commercial establishments is usually expressed in ____________ .

1. newton metre
2. erg
3. joule
4. kilowatt hour

Q. Which of these appliances does not use an electromagnet?

(a) washing machine
(b) refrigerator
(c) room heater
(d) electric bell

Q. Make a diagram of electric bell and explain its working system.

Q. Which of the following does NOT contain a heating element?

Q. Which of the following electrical appliances does not have a heating element?

1. Electric cooker
2. Electric toaster
3. Electric switch
4. Soldering iron

Q. Which of the following does NOT produce electrical energy?

1. Generator
2. LED
3. Battery
4. Cell

Q. When a bulb glows it emits both heat and light.

1. False
2. True

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. When a bulb glows it emits both heat and light.

1. False
2. True

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

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

Q.

An electric bulb works on which of the following principles:

1. Magnetic effect of electric current

2. Magnetic and Heating effect of electric current

3. Heating effect of electric current

4. Chemical effect of electric current