In the circuit shown below, the battery voltage is 12 volts and the light bulbs are all identical. What is the voltmeter reading?

4 volts

Explanation:

The diagram to the question is attached below.

Given that:

the battery voltage is = 12 volts

and the lights bulbs are identical; we can see that there are 3 light bulbs shown in the diagram below:

We can also see that the circuits are connected in series: if one light bulb happens to be removed from the circuit, the remaining light bulb will go out.

Thus; the voltage on each bulb since they are identical = V/3

= 12/3

= 4 volts