Fig. 7.1 depicts a circuit made up of a battery, a switch, a voltmeter and three $40\,\Omega$ resistors, $R_1$, $R_2$ and $R_3$. The switch is open, and resistors $R_1$ and $R_2$ act as a potential divider.
(a)[2]
Describe the meaning of a potential divider.
(b(i))[1]
Calculate the electromotive force (e.m.f.) of the battery.
(b(ii))[3]
Calculate the total resistance of the circuit.
(c)[2]
Calculate the reading on the voltmeter when the switch is closed.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A potential divider divides, shares or splits the e.m.f./voltage/p.d.” …