Read Resistor Networks Through Power and Potential Difference
A network question becomes manageable once every resistor is labelled with the same three quantities: current, voltage drop, and power. Use the one quantity supplied to anchor the network.
Electricity questions depend on identifying charge, a conducting path and the condition that controls current or magnetic effect.
Separate charge, current and the path between them
Charge is a property · current needs a conducting path
Charge is a property; current needs a conducting path. Decide first whether the question concerns charging, resistance, current or earthing.
Start from the known power
That value fixes all other series or parallel relations connected to it.
Use the topology, not appearance
Series elements share current; parallel elements share potential difference. Redraw nodes if the diagram looks confusing—components on the same two nodes are parallel.
Verify with conservation
Total power supplied must equal the sum of resistor powers. This is a fast check before choosing an option.
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- ✓Convert the given power into I or V.
- ✓Mark equal-potential nodes.
- ✓Check series current and parallel voltage before calculating.
Two resistors that are drawn one above the other are not automatically parallel; they must share both end nodes.
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