Explanations & Calculations
- If the resistors here in series are those 30 ohms and 10 ohms.
- Then the combined resistance is 30+10 = 40 Ohms.
- The potential difference is what the voltmeter measures and it could be 120V according to the diagram you have.
- If the voltage 120V is across the two resistors, then the potential difference across 30 Ohm is
V30=120×30+1030=90V
- Since the current through each resistor is the equivalent current that flows in the circuit,
Ieq=40Ω120V=3A
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