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Why do fuse wire have low melting point? Give reasons for melting of fuse wires.

Important Questions on Electric Current and Its Effects

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

What are the functions of an earth wire? Why is it necessary to earth metallic appliances?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Why is fuse wire always placed in a live circuit?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

If a bulb of

60 W

is connected across a source of

220 V

, find the current drawn by it.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

When $2 A$ current is passing through a conductor in $10$ seconds, $80 J$ heat is produced then find the resistance of conductor.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Which wire in a power circuit is connected to the metallic body of the appliance?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

When does an electric short circuit and overloading occur?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit?

MEDIUM

Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

According to Joule’s law of heating, mention the factors on which heat produced in a resistor depends. According to this law write the formula used to calculate the heat produced.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Correct the statements by modifying the underlined words appropriately if it is wrong.

Heating coils are made up of materials having high resistivity and low melting point.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

In the electric equipment producing heat e.g., iron, electric heater, boiler, toaster etc., an alloy such as Nichrome is used, not pure metals. Give Scientific reason.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Why are the heating elements of electric toasters and electric irons made of an alloy rather than a pure metal?

MEDIUM

Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Two tungsten bulbs of power

50 W

and

60 W

power work on

220 V

potential difference. If they are connected in parallel, how much current will flow in the main conductor?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

What characteristics should a fuse wire have?

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Identify the following wires used in a household circuit :
(i) The wire is also called as the phase wire.
(ii) The wire is connected to the top terminal of a three pin socket.

MEDIUM

Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

How does overload and short-circuit occur in an electric circuit ? Explain. What is the function of fuse during this situation?

EASY

Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Suggest any two measures to avoid overloading in domestic circuits.

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current

Write the conventional symbol of the following component used in electric circuit diagram-

Electric bulb

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Science>Physics>Electric Current and Its Effects>Heating Effect of Electric Current