I am completely lost with this question! Any help would be greatly appreciated!!

Question

I am completely lost with this question! Any help would be greatly appreciated!!

A complete series circuit consists of a 12.5Vbattery, a 4.68? resistor, and a switch. The internal resistance of the battery is 0.360? .

Part A

What does an ideal voltmeter read when placed across the terminals of the battery? The switch is open.

Answer in V

Part B

What does an ideal voltmeter read when placed across the resistor? The switch is open.

Answer in V

Part C

What does an ideal voltmeter read when placed across the switch? The switch is open.

Answer in V

Part D

What does an ideal voltmeter read when placed across the terminals of the battery? The switch is closed.

Answer in V

Part E

What does an ideal voltmeter read when placed across the resistor? The switch is closed.

Answer in V

Part F

What does an ideal voltmeter read when placed across the switch? The switch is closed.

Answer in V

Explanation / Answer

emf of the battery = E = 12.5 volts

resistance = R = 4.68 ohm

internal resistance = r = 0.36

total resistance of the circuit = Rtotal = R + r = 4.68 + 0.36 = 5.04 ohm

Current flowing the circuit is given as ::

i = E/Rtotal = 12.5 / 5.04

i = 2.48 A

A)

Voltage across the battery is given as ::

V = E

V = 12.5 volts

this is the reading of the voltmeter.

B)

voltage across the external resistance is given as ::

V' = iR

since switch is open , i=0

hence V' =0

C)

Voltage = infinite

D)

the terminal Voltage across the battery is given as ::

V = E - ir

V = 12.5 - 2.48 x 0.36

V = 11.61 volts

this is the reading of the voltmeter.

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