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Redraw the circuit of Question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 W resistor. What would be the readings in the ammeter and the voltmeter?
Resistance of circuit,
= R1 + R2 + R3
= 5 + 8 + 12
= 25 W
Using Ohm’s law
I = V/R
I = (2X3)/25
I = 6/25
I = 0.24 Ω
The potential difference between 12 Ω resistor is
V = IR
V = 0.24 × 12
V = 2.88 V
The reading of the ammeter is 0.24 A and the voltmeter is 2.88 V.
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