Electricity and Circuits

1.
Fill in the blanks with the correct words.
1. Inside the transparent glass bulb, there is a very thin ____________ (metal/non-metal) wire.
2. A ____________ (source/conductor) is a device that produces electric current.
3. In a dry cell, electricity is produced by ____________ (the sun/a chemical reaction).
4. Electric current flows only if the circuit is ____________ (close/open).
5. Electric current flows in a ____________ (different/particular) direction.
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Answer:
S A M P L E
metal
source
a chemical reaction
close
particular
2.
What is the name given to the class of cells, which can be recharged once they are drained?
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Answer:
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Secondary cells.
3.
Name one electrical device that uses a dry cell.
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Answer:
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Torch.
4.
What is the name given to an electric circuit that is not complete?
5.
Write T for the true statement and F for the false one. Correct the false statement(s).
1. We cannot turn on or off an electric bulb using a switch.
2. When the switch is in the OFF position, the electric circuit is open.
3. A switch is sometimes referred to as 'key'.
4. An insulator is a material through which an electric current cannot flow.
5. All metals are bad conductors of electricity.
6.
Sort out the conductors and insulators from the following list.
1. Graphite 2. Plastic 3. Silver 4. Glass 5. Pure water 6. Dry air 7. Aluminium

13 more answer(s) available.