Give an example of a metal which is the best conductor of heat.

If an electric current $I$ flows through a resistor $R$ in a circuit for time $t$,then the electrical energy $W$ consumed is given by:

You are given three equal resistors. The number of resistances which can be obtained by joining them in series and in parallel grouping is

The resistance of a piece of rubber is higher than that of a piece of copper of the same dimensions.

$(a)$ Name the instrument/device used to measure electric current in a circuit.
$(b)$ How is an ammeter connected in a circuit to measure current flowing through it?

State the formula correlating the electric current flowing in a conductor and the voltage applied across it. Also, show this relationship by drawing a graph. What would be the resistance of a conductor, if the current flowing through it is $0.35 \ A$ when the potential difference across it is $1.4 \ V$?