(a)[1]
Calculate the total resistance of R$_1$ and R$_2$ for the arrangement shown in Fig. 7.1.
(b)[3]
Show that the current in the circuit is roughly 0.25 A.
(c)[1]
Determine the potential difference (p.d.) between the ends of R$_1$.
(d)[3]
Calculate the power transferred in R$_1$.
(e)[1]
A student makes a different circuit using R$_1$, R$_2$ and the battery. The resistors R$_1$ and R$_2$ are arranged so that their combined resistance is as small as it can be. Draw a circuit diagram to show the way R$_1$ and R$_2$ are linked to the battery.