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According to Joule's law of heating, the heat produced in a resistor is

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Important Questions on Electricity

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Science>Physics>Electricity>Heating Effect of Electric Current
What characteristics should a fuse wire have?
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Science>Physics>Electricity>Heating Effect of Electric Current
When does an electric short circuit and overloading occur?
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Science>Physics>Electricity>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>Electricity>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>Electricity>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>Electricity>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>Electricity>Heating Effect of Electric Current
Why is fuse wire always placed in a live circuit?
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Science>Physics>Electricity>Heating Effect of Electric Current
400 J of heat is produced per second in a 4 Ω resistor. Calculate the potential difference across the resistor.
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Science>Physics>Electricity>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>Electricity>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>Electricity>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>Electricity>Heating Effect of Electric Current
Write Joule's law of heating.
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Science>Physics>Electricity>Heating Effect of Electric Current
Write two precautions taken to avoid the overloading of domestic electric circuits.
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Science>Physics>Electricity>Heating Effect of Electric Current
Which wire in a power circuit is connected to the metallic body of the appliance?
HARD
Science>Physics>Electricity>Heating Effect of Electric Current
State Joule's law of heating. When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
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Science>Physics>Electricity>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?
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Science>Physics>Electricity>Heating Effect of Electric Current
Which of the following is known as Joule's equation?
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Science>Physics>Electricity>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>Electricity>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>Electricity>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?