Electricity Calculator
Calculate power, voltage, current, resistance, energy, and cost using Ohm's law and electrical formulas. Supports multiple calculation methods with step-by-step solutions and visualizations.
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Complete User Guide
What is Electricity Calculator?
The Electricity Calculator is a comprehensive tool for calculating electrical parameters using Ohm's law and power formulas. It can calculate power, voltage, current, resistance, energy consumption, and electricity costs. This calculator is essential for electrical engineers, students, electricians, and anyone working with electrical circuits.
How to Use This Calculator
- Select a calculation type from the dropdown (Power, Voltage, Current, Resistance, Energy, or Cost).
- Choose the calculation method based on the values you have available.
- Enter the required values in the input fields. All values must be positive numbers.
- Select appropriate units for your inputs and desired result unit.
- Click 'Calculate' to see the results with detailed step-by-step solutions and visualizations.
Calculation Types
Calculate Power
Calculate electrical power from voltage and current (P = V × I), voltage and resistance (P = V² / R), or current and resistance (P = I² × R).
Calculate Voltage
Calculate voltage from power and current (V = P / I), current and resistance (V = I × R), or power and resistance (V = √(P × R)).
Calculate Current
Calculate current from power and voltage (I = P / V), voltage and resistance (I = V / R), or power and resistance (I = √(P / R)).
Calculate Resistance
Calculate resistance from voltage and current (R = V / I), voltage and power (R = V² / P), or power and current (R = P / I²).
Calculate Energy
Calculate energy consumption from power and time using the formula E = P × t. Supports various time units (seconds, minutes, hours, days).
Calculate Cost
Calculate electricity cost from energy consumption and rate per kWh using the formula Cost = Energy × Rate.
Ohm's Law and Power Formulas
Ohm's Law:
V = I × R
Where:
- V = Voltage (Volts)
- I = 当前 (Amperes)
- R = Resistance (Ohms)
Power Formulas:
- P = V × I (Power from voltage and current)
- P = V² / R (Power from voltage and resistance)
- P = I² × R (Power from current and resistance)
- E = P × t (Energy from power and time)
Ohm's law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. The power formulas allow you to calculate electrical power consumption in various ways depending on the known parameters.
Supported Units
Power Units
- W (Watts)
- kW (Kilowatts)
- MW (Megawatts)
- hp (Horsepower)
- BTU/h (BTU per hour)
Voltage Units
- V (Volts)
- kV (Kilovolts)
- mV (Millivolts)
Current Units
- A (Amperes)
- mA (Milliamperes)
- kA (Kiloamperes)
Resistance Units
- Ω (Ohms)
- kΩ (Kiloohms)
- MΩ (Megaohms)
Important Notes
- All input values must be positive numbers (non-negative).
- Resistance must be greater than zero for calculations involving division by resistance.
- Current and voltage must be greater than zero when used as divisors in calculations.
- The calculator automatically handles unit conversions between different measurement systems.
- For energy calculations, time can be entered in seconds, minutes, hours, or days.
- For cost calculations, enter the electricity rate per kWh in your local currency.
- Results are displayed with step-by-step solutions showing the calculation process.
- Visual charts help understand the relationship between different electrical parameters.
Common Applications
- Circuit design and analysis for electrical engineers
- Calculating power consumption for household appliances
- Estimating electricity costs for budgeting
- Educational purposes for students learning electrical principles
- Troubleshooting electrical circuits
- Selecting appropriate wire gauges and circuit breakers
- Designing solar power systems and battery banks