Redraw the circuit of Question 12, putting in an ammeter to measure the current
through the resistors and a voltmeter to measure the potential different across the 12
resistors. What would be the readings in the ammeter and the voltmeter?
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Answer:
Where,
Potential difference, V = 6 V
Current flowing through the circuit/resistors = I
Resistance of the circuit, R = 5 + 8 + 12 = 25ohm
I = V/R = 6/25 = 0.24 A
Potential difference across 12ohm resistor = V1
Current flowing through the 12ohm resistor, I = 0.24 A
Therefore, using Ohm’s law, we obtain
V1 = IR = 0.24 x 12 = 2.88 V
Therefore, the reading of the ammeter will be 0.24 A.
The reading of the voltmeter will be 2.88 V.
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