Give a single word for $\frac{1 \text{ joule}}{1 \text{ coulomb}}$.

If the charge on an electron is $1.6 \times 10^{-19} \text{ C}$,find the approximate number of electrons in $1 \text{ C}$.

$(a)$ Define potential difference between two points in a conductor.
$(b)$ Name the instrument used to measure the potential difference in a circuit. How is it connected?
$(c)$ $A$ current of $2 \, A$ passes through a circuit for $1$ minute. If the potential difference between the terminals of the circuit is $3 \, V$, what is the work done in transferring the charges?

Of the two bulbs in a house, one glows brighter than the other. Which of the two has a larger resistance?

The electrical appliance having higher power draws a larger current.

How would the reading of the voltmeter $(V)$ change if it is connected between points $B$ and $C$? Justify your answer.