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CircuitLab
V = I · R, plus P = V · I.
Ohm's law relates voltage, current, and resistance in a simple resistive circuit — know any two, and the third is fixed. It's the starting point for essentially all basic circuit analysis.
Higher resistance means less current flows for a given voltage — this is why fuses, resistors, and proper wire gauges are chosen deliberately to keep current (and the heat it generates) within safe limits.
Voltage (V)
200
V = I · R
What you entered
Ohm's law: V = I × R
2 × 100= 200 VPower dissipated: P = V × I
200 × 2= 400 WResult
Voltage (V): 200
A circuit carrying 2A through 100Ω needs 200V and dissipates 400W.