Match the following Column A Column B 1 . Cell used to open or close a circuit 2 . Switch safety device used in electric circuit 3 . Circuit A complete path for the flow of an electric current 4 . Miniature circuit breaker Reset by hand, circuit becomes complete once again 5 . Fuse A device which converts chemical energy into electrical energy

1 . Cell A device which converts chemical energy into electrical energy Explanation Cells are portable sources of electrical energy. Cells are of two types, namely primary and secondary cells. The chemical reaction inside the primary cell is irreversible. 2 . Switch used to open or close a circuit Explanation An electric switch is used to turn on or off the appliance. Current flows in the circuit when the circuit is said to be closed. 3 . Circuit A complete path for the flow of an electric charge Explanation A basic circuit consists of a switch, cell, bulb, and an ammeter. The current flows through the closed circuit. 4 . Miniature circuit breaker Reset by hand, circuit becomes complete once again Explanation MCBs are used as safety devices in household electric circuits. They automatically shut down when there is an overflow of current and prevent damage. 5 . Fuse Safety device used in electric circuit Explanation Whenever there is an overload of current passing through the wire, the wire melts down and shuts down the circuit. 1 . Cell A device which converts chemical energy into electrical energy. 2 . Switch Used to open and close a circuit. 3 . Circuit A complete path for the flow of an electric current. 4 . Miniature circuit breaker Reset by hand, circuit becomes complete again. 5 . Fuse Safety device used in electric circuit.

E M B I B E

Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q III

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7th Tamil Nadu Board

IMPORTANT

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Electron flow is in the same direction to conventional current flow.

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Important Questions on Electricity

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7th Tamil Nadu Board

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Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q III

The fuse wire does not melt whenever there is overload in the wiring.

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7th Tamil Nadu Board

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Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q III

In a parallel circuit, the electric components are divided into branches.

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7th Tamil Nadu Board

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Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q III

The representation of the electric current is

A

.

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Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q III

The electrical conductivity of the semiconductor is in between a conductor and an insulator.

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7th Tamil Nadu Board

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Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q IV

Match the following

Column A	Column B
$1$ . Cell	used to open or close a circuit
$2$ . Switch	safety device used in electric circuit
$3$ . Circuit	A complete path for the flow of an electric current
$4$ . Miniature circuit breaker	Reset by hand, circuit becomes complete once again
$5$ . Fuse	A device which converts chemical energy into electrical energy