Match the terms in Column I to the symbols in Column II and match the correct explanation in Column III Column I Column II Column III 1. Bulb (a) (i) has coiled tungsten filament 2. Switch (b) (ii) series of cells connected with correct polarity. 3. Fuse (c) (iii) source of electric current. 4. Cell (d) (iv) used to close or open an electric circuit. 5. Battery (e) (v) is a wire with a low melting point.

1. Bulb - (d) - (i) has coiled tungsten filament Tungsten is used in the filament of a bulb. As the heating effect of current is used for the bulb, we always use the metal with highest melting point. 2. Switch - (a) -(iv) used to close or open an electric circuit. A switch is a device used to close or open an electric circuit. It consists of two brass terminals into which fits in another piece of brass. 3. Fuse - (e) - (v) is a wire with a low melting point. The low melting point of the fuse helps it in melting quickly and breaking the circuit when there is an excessive flow of current in the circuit. It helps the home appliances from high current flow. 4. Cell - (b) - (iii) source of electric current. A cell is a single unit that converts chemical energy into electrical energy. 5. Battery - (c) - (ii) series of cells connected with correct polarity. A group of two or more cells when connected together with correct polarities is called a battery. The positive terminal of the one cell is connected to the negative terminal of the other one. Column I Column II Column III 1. Bulb (d) (i) has coiled tungsten filament 2. Switch (a) (iv) used to close or open an electric circuit. 3. Fuse (e) (v) is a wire with a low melting point. 4. Cell (b) (iii) source of electric current. 5. Battery (c) (ii) series of cells connected with correct polarity.

E M B I B E

Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q D

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The magnetic strength in a conductor decreases with the increase in current.

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Important Questions on Electric Current and its Effects

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Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q E

Match the terms in Column I to the symbols in Column II and match the correct explanation in Column III

Column I	Column II	Column III
1. Bulb	(a)	(i) has coiled tungsten filament
2. Switch	(b)	(ii) series of cells connected with correct polarity.
3. Fuse	(c)	(iii) source of electric current.
4. Cell	(d)	(iv) used to close or open an electric circuit.
5. Battery	(e)	(v) is a wire with a low melting point.

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Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q F

Solve the following crossword puzzle.
Question Image

ACROSS
3. This device is based on direct application of electromagnets.
5. This device is used to close or open an electric circuit.
DOWN
1. This substance allows the flow of current.
2. A cylindrical coil of wire.
4. It is a piece of wire twisted to form a circle.

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Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q A

What is a short-circuit?

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7th CBSE

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Frank Everyday Science>Chapter 14 - Electric Current and its Effects>Let's revise>Q A

What are electromagnets?

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