Electricity Calculator
Calculate power consumption, energy costs, and electrical circuit parameters
Power Formula
P = V × I
Where:
- P = Power in Watts (W)
- V = Voltage in Volts (V)
- I = Current in Amperes (A)
Current Formula
I = P ÷ V
Where:
- I = Current in Amperes (A)
- P = Power in Watts (W)
- V = Voltage in Volts (V)
Energy Cost Formula
Cost = (Power × Hours × Days × Rate) ÷ 1000
Where:
- Power in Watts (W)
- Hours per day
- Days per month (default 30)
- Rate in $ per kWh
Energy Consumption Formula
Energy = (Power × Time) ÷ 1000
Where:
- Energy in kilowatt-hours (kWh)
- Power in Watts (W)
- Time in hours
Ohm's Law Formulas
V = I × R
I = V ÷ R
R = V ÷ I
P = V × I = I² × R = V² ÷ R
Circuit Formulas
Series: Rtotal = R1 + R2 + ... + Rn
Parallel: 1/Rtotal = 1/R1 + 1/R2 + ... + 1/Rn
| Appliance | Power (W) | Calculate |
|---|
Appliance Energy Use
Daily Energy = (Power × Hours) ÷ 1000 (kWh)
Monthly Cost = Daily Energy × 30 × Rate
About the Electricity Calculator
Our comprehensive electricity calculator helps you understand and calculate various electrical parameters for both household and educational purposes. Whether you're a homeowner trying to estimate your energy bills, a student learning electrical principles, or a professional needing quick calculations, this tool provides accurate results instantly.
Key Features:
- Power Calculator: Calculate electrical power (watts) from voltage and current
- Current Calculator: Determine current flow from power and voltage
- Energy Cost Calculator: Estimate electricity costs for appliances and devices
- Consumption Calculator: Calculate energy usage in kilowatt-hours (kWh)
- Ohm's Law Calculator: Solve for voltage, current, resistance, or power
- Circuit Calculator: Analyze series and parallel circuits
- Appliance Calculator: Pre-loaded with common appliance wattages
Understanding Electrical Terms:
| Term | Symbol | Unit | Description |
|---|---|---|---|
| Voltage | V | Volts (V) | Electrical potential difference |
| Current | I | Amperes (A) | Flow of electric charge |
| Resistance | R | Ohms (Ω) | Opposition to current flow |
| Power | P | Watts (W) | Rate of energy transfer |
| Energy | E | kWh | Power consumed over time (what you pay for) |
Frequently Asked Questions
How do I calculate my electricity bill?
Your electricity bill is calculated by multiplying the energy you use (in kWh) by your electricity rate (cost per kWh). Our Energy Cost calculator can help you estimate this for specific appliances.
What's the difference between watts and kilowatt-hours?
Watts (W) measure power - the rate at which energy is used. Kilowatt-hours (kWh) measure energy - the total amount of power used over time. 1 kWh = using 1000 watts for 1 hour.
How can I reduce my electricity consumption?
Some tips: 1) Use energy-efficient appliances (look for ENERGY STAR rating), 2) Turn off devices when not in use, 3) Use LED lighting, 4) Adjust thermostat settings, 5) Unplug devices that draw "phantom load".
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 (V = I × R). It's fundamental to understanding electrical circuits.
How do series and parallel circuits differ?
In series circuits, components are connected end-to-end, and the same current flows through all components. In parallel circuits, components are connected across the same voltage, and current divides among paths.