Physics 5054 · O Level · Series and parallel circuits
Series and parallel circuits — practice question
Two lamps, P and Q, are joined to a battery with electromotive force (e.m.f.) $6.0\,\text{V}$ and an ammeter, as shown in Fig. 6.1.
Lamp P has a resistance of $15\,\Omega$. The ammeter gives a reading of $0.65\,\text{A}$.
(a)[2]
Calculate the current in lamp P.
(b)[2]
Calculate the resistance of lamp Q.
(c(i))[1]
In the space below, sketch the circuit diagram.
(c(ii))[1]
Explain why the ammeter reading is less than $0.65\,\text{A}$ when the lamps are connected in series.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Use Ohm's law $I = V/R$.” …