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Ohm's Law - Interactive Circuit

Explore voltage, current, resistance & watch bulbs glow or burst!

Circuit Controls

Selected: 5W bulb

12.0 V

Adjust battery voltage (1V - 48V)

100 Ω

Change resistor value (5Ω - 500Ω)

1.0x
V-I Characteristic

Linear relationship: For R = 100Ω, the current increases proportionally with voltage

Ohm's Law Calculator
Bulb 1
5W
1.44W / 5WSAFE
5W
OK
15W
OK
40W
OK
100W
OK
Ohm's Law
V = I × R
Voltage = Current × Resistance
Voltage (V)
12.00 V
Current (I)
0.120 A
Resistance (R)
100 Ω
Power (P)
1.44 W
Power Formula
P = V × I
1.44W = 12.00V × 0.120A

Bulb Rating Guide

  • ● 0-80%: Safe operation
  • ● 80-120%: Warning - bulb hot
  • ● 120-150%: Danger zone
  • ● >150%: Bulb will BURST!