Three resistors are connected in series with a battery, as shown.

Resistor A has the greatest resistance of the three. The current through A is $1.4 \mathrm{A}$ . What can you say about the currents through B and C?

What is the combined resistance of three $30 \mathrm{\Omega }$ resistors connected in series?

Two resistors are to be connected to form a potential-divider circuit. Should they be connected in series or in parallel with each other?

State briefly the function of a potential- divider circuit.

Use the idea of resistors in series to explain why a long wire has more resistance than a short wire (of the same thickness and material).

Use the idea of resistors in parallel to explain why a thick wire has less resistance than a thin wire (of the same length and material).