Question

The diagram below pictures three identical light bulbs, each with a resistance of 1 ohm, which are connected by resistance-free wires. A 9-volt battery supplies energy to the circuit.
The total resistance for the circuit shown in Figure 21-2A is:

1 ohm.
1 volt.
3 ohms.
3 volts.

Answer 1

The total resistance is 3 ohms.

And the battery voltage ... or even the presence of a battery ... doesn't matter.