Assertion (A): Heating element of an electric heater must have high resistance and high melting point.

Reason (R): If resistance is high, the electric conductivity will be less.

Assertion(A) : A fuse wire must have high resistance and low melting point.

Reason(R) : Fuse is always inserted in live wire.

Assertion(A) : Conducting wires are made of copper.

Reason(R) : Resistivity of copper is very high.

Assertion(A) : Alloys are commonly used in electrical heating devices like, electrical iron, toasters etc.

Reason(R) : Alloys do not burn/oxidise at high temperatures.

Assertion(A) : Electric current is the rate of flow of electric charge.

Reason(R) : Electric current is directly proportional to the potential difference.

Assertion: If a device draws a current of 4A when connected to a 100 V source then same device will draw a current of 8 A when connected to a 200 V source.

Reason : At constant temperature, electric current is inversely proportional to the potential difference across the conductor.

Assertion(A) : Longer wire have greater resistance whereas shorter wire has lesser resistance.

Reason(R) : Resistance is inversely proportional to the length of the wire.

Assertion(A) : Tungsten metal is used for making filament of incandescent lamps.

Reason(R) : The melting point of tungsten is very low.

Assertion(A) : If a graph is plotted between potential difference applied to a conductor and electric current flowing through it, the graph is a straight line passing through the origin. 

Reason(R) : Electric current flowing in a conductor is directly proportional to the potential difference applied across its ends.

Assertion(A) : A current carrying wire is electrically charged.

Reason(R) : Electric current is the rate of flow of electric charge.