What is the battery current $I_{\text{b}\text{a}\text{t}}$ when the switch in is open?

Express your answer with the appropriate units.

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Part B

What is the potential difference $V_1-V_2$ between points $1$ and $2$ when the switch is open?

Express your answer with the appropriate units.

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Part C

What is the battery current $I_{\text{b}\text{a}\text{t}}$ when the switch is closed?

Express your answer with the appropriate units.

$$

Part D

What is the potential difference $V_1-V_2$ between points $1$ and $2$ when the switch is closed?

Express your answer with the appropriate units.