learn.howToCalculate
learn.whatIsHeading
Ohm's Law describes the fundamental relationship between voltage, current, and resistance in electrical circuits. It states that the current flowing through a conductor is directly proportional to voltage and inversely proportional to resistance.
공식
The calculator solves for the missing value using V = I × R
- V
- I × R — I × R
- I
- I value — Variable used in the calculation
- R
- R value — Variable used in the calculation
단계별 가이드
- 1Enter any two of the three values: voltage (V), current (I), or resistance (R)
- 2The calculator solves for the missing value using V = I × R
- 3Results display the calculated value with step-by-step work shown
풀어진 예시
입력
V = 12V, R = 4Ω
결과
I = 3A
12 ÷ 4 = 3 amps
피해야 할 일반적인 실수
- ✕Confusing milliamps (mA) with amps (A) — 1A equals 1000mA
- ✕Forgetting to convert kilohms (kΩ) to ohms (Ω) before calculations
자주 묻는 질문
Does Ohm's Law apply to all materials?
No, it applies only to ohmic materials where resistance remains constant. Non-ohmic materials like diodes and thermistors have variable resistance.
What happens with zero resistance?
Zero resistance would create a short circuit with theoretically infinite current, which is why fuses and circuit breakers protect circuits.
계산할 준비가 되셨나요? 무료 Ohm's Law 계산기를 사용해 보세요
직접 시도해 보세요 →