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In an open circuit, the electric component that remains open is 

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Important Questions on Electric Current and Its Effects

EASY

Which of the units given below is the SI unit of resistance?

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In the given circuit diagram, identify the objects marked as 1, 2, 3.

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EASY

Observe the correlation in the first pair and complete the second pair:
1 volt=1 Joule1 Coulomb:: 1 ohm=________

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The diagram below shows a dual control switch circuit connected to a bulb. Copy the diagram and complete it so that the bulb is switched ON.

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EASY
Why is an electric fuse required in all electrical appliances?
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Match the following.

Column A Column B
1. Battery a. circuit
2. Bell b. safety
3. Geyser c. cells
4. Switch d. heating coil
5. Fuse e. electromagnetic

 

EASY
Name and describe the main components of an electric circuit.
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State the composition of material of the fuse wire.
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Why can't we use a copper wire for making an electric fuse?
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No appliances work when the circuit is _____(open/closed).
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Match the following:

  Column A   Column B
1 Tungsten A High resistance
2 Nichrome wire B Bulb
3 Soft iron C Low resistance
4 Mica D Electric iron
5 Copper E Electromagnet

 

EASY
When negative terminals of all the cells are connected together, the cells are connected in _____.
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Give the electrical symbols for electric bulb.
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Name the material used in making a filament of bulb?
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Current flows through a _____ (open/ closed) circuit.
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In which direction does the current flow in a closed circuit?
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Give the electrical symbols for a resistance.
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Give the electrical symbols for electric cell.