The unit of electric potential difference is the:

$($a$)$ ampere

$($b$)$ volt

$($c$)$ ohm

$($d$)$ watt

According to the "electron$-$flow" method, when electric current flows in a conductor:

$($a$)$ it is the electrons that move.

$($b$)$ it is the protons that move.

$($c$)$ it is the neutrons that move.

$($d$)$ none of the above.

An ammeter is used to measure the current in a circuit. How is it connected?

$($a$)$ in parallel

$($b$)$ in series

$($c$)$ both $($a$)$ or $($b$)$

$($d$)$ neither $($a$)$ or $($b$)$

The unit of electric resistance is the:

$($a$)$ ampere

$($b$)$ volt

$($c$)$ ohm

$($d$)$ watt