Simulate series and parallel resistor circuits: add resistors, set a source voltage and see total resistance, total current and the voltage or current through each resistor, with a live circuit diagram.
Same current flows through every resistor; voltages add up.Same voltage across every resistor; currents add up.
Resistor
Resistance
Voltage
Current
No resistors yet — click Add resistor to start.
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Total resistance
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Total current
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Resistor
Circuit diagram
Pick Series or Parallel, set the source voltage (V) and add one or more resistors with their resistance (Ω). In series the total resistance is the sum and the same current flows through each, with the voltage dividing proportionally. In parallel the reciprocal of the total resistance is the sum of reciprocals, the voltage is the same across each resistor and the currents add up. Results update live; use ✕ to remove a resistor and Clear to start over.