Ohm's Law Calculator ⚡
Calculate voltage, current, resistance, and power using Ohm's Law (V = I × R). Enter any two values to calculate the third.
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Understanding Ohm's Law
What is Ohm's Law?
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them.
Key Concepts
- Voltage (V): The electrical potential difference, measured in volts (V)
- Current (I): The flow of electric charge, measured in amperes (A)
- Resistance (R): Opposition to current flow, measured in ohms (Ω)
- Power (P): Rate of energy transfer, measured in watts (W)
Practical Applications
- Designing electrical circuits and choosing appropriate components
- Calculating power consumption of electrical devices
- Determining proper wire gauge and fuse ratings
- Troubleshooting electrical problems
Tips
- Always check your units before calculation
- For AC circuits, consider impedance instead of simple resistance
- Remember that resistance can change with temperature
- Use appropriate safety margins when designing circuits