Electricity Calculator - Calculate Voltage, Current & Power Online
Free online electricity calculator to calculate voltage, current, resistance, and power using Ohm's law. Perfect for physics students and electrical engineering.
Electrical Properties
Electrical Results
Enter electrical properties to calculate missing values
About Electricity Calculator
The Electricity Calculator helps you calculate electrical properties using Ohm's law and power formulas.
Ohm's Law:
V = IR
Where:
- V = Voltage (Volts)
- I = Current (Amperes)
- R = Resistance (Ohms)
Power Formulas:
- P = VI - Power = Voltage × Current
- P = I²R - Power = Current² × Resistance
- P = V²/R - Power = Voltage² ÷ Resistance
Electrical Properties:
- Voltage (V): Electrical potential difference
- Current (I): Flow of electric charge
- Resistance (R): Opposition to current flow
- Power (P): Rate of energy transfer
Circuit Types:
- Series Circuit: Components connected end-to-end
- Parallel Circuit: Components connected across same voltage
- Mixed Circuit: Combination of series and parallel
Applications:
- Physics education and homework
- Electrical engineering
- Circuit design and analysis
- Electronics troubleshooting
- Power system calculations
Units:
- Voltage: Volts (V)
- Current: Amperes (A)
- Resistance: Ohms (Ω)
- Power: Watts (W)
Note: This calculator assumes DC circuits and linear components. For AC circuits, consider impedance, phase angles, and frequency effects.
Frequently Asked Questions
What is Ohm's law?
Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance as the constant: V = IR.
How do I calculate power?
Power can be calculated using P = VI (voltage × current), P = I²R (current² × resistance), or P = V²/R (voltage² ÷ resistance).
What's the difference between voltage and current?
Voltage is the electrical potential difference that drives current flow, while current is the actual flow of electric charge through a conductor.
How does resistance affect current?
Resistance opposes current flow. Higher resistance means lower current for a given voltage, following Ohm's law: I = V/R.
Can I use these formulas for AC circuits?
These formulas work for DC circuits. For AC circuits, you need to consider impedance, phase angles, and frequency effects. The basic relationships still apply but with complex numbers.