Electromagnetism

Ohm's Law

Voltage, current and resistance V = IR

  • High school
  • about 3 min
  • 1 of 4 in the family
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12 V4 ΩI = 3.00 A

Parameters

I=VR=124=3.00 AI = \frac{V}{R} = \frac{12}{4} = 3.00\,\text{A}

Power P = V·I = 36.0 W

• Higher voltage → more current • Higher resistance → less current • Current is proportional to voltage, inversely to resistance