Question $1$

$($a$)$

$($i$)$ Determine the voltage across each resistor $R_1$ and $R_2,$ the total resistance, and the total power dissipated in the circuit of Figure $1.$

$[5]$

Figure Q$1-$ Circuit with voltage source and two resistors.

If a unit of electricity $(1$ kWh $)$ costs $20$ cents, how much will it cost to operate a $1200-$W heater and three $20-$W light bulbs from $8\mathrm{.}30$ pm to $10\mathrm{.}30$ pm every night for a full week?

$[5]$