Describe how the output from an a.c. supply is different from the output of a direct current (d.c.) supply. Sketch two voltage-time graphs in the blank space to support your explanation.
The lamp has a rating of $60\,\text{W}$ and is intended for use with a $240\,\text{V}$ supply. Calculate the current in the lamp.
Calculate the resistance of the lamp.
State two advantages of connecting the lamps in parallel rather than in series.
The five lamps are lit for an average of $5.5$ hours each day over a year. Electricity costs $\$0.15/\text{kWh}$. Calculate the cost of using these lamps for a year.
Draw the circuit diagram for the setup used to find the resistance of the lamp.
State how the resistance value in this circuit is different and explain why it is different.