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Question 61
Medium

The battery in this circuit has an emf of 12.0 V12.0\text{ V}12.0 V and negligible internal resistance. A circuit diagram with a 12.0 V battery at the top. The circuit consists of two main series sections. The left section contains a branch with a 15 \Omega resistor in series with a switch, and an ideal voltmeter V connected in parallel across this entire branch. The right section contains two 60 \Omega resistors connected in parallel with each other. The junction between the left section and the right section connects the switch/voltmeter output to the inputs of the two 60 \Omega resistors.

What are the readings on the voltmeter when the switch is open (off) and when the switch is closed (on)?

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