Electric Power Consumption Calculator
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Reviewed by Calculator Editorial Team
Electric power consumption measures how much electrical energy a device or system uses over time. This calculator helps you determine power consumption in kilowatt-hours (kWh) based on voltage, current, and time.
How to Use This Calculator
To calculate electric power consumption:
- Enter the voltage in volts (V)
- Enter the current in amperes (A)
- Enter the time in hours (h)
- Click "Calculate" to see the power consumption in kilowatt-hours (kWh)
The calculator will display the result and show a breakdown of the calculation. You can also view a chart showing the power consumption over time.
Formula Explained
The electric power consumption is calculated using the following formula:
Power (kWh) = (Voltage × Current × Time) / 1000
Where:
- Voltage (V) = Electrical potential difference
- Current (A) = Flow of electric charge
- Time (h) = Duration of power usage
This formula converts the power from watts to kilowatt-hours, which is a more common unit for measuring energy consumption.
Worked Examples
Example 1: Household Appliance
Suppose you have a 100W light bulb that runs for 5 hours. The voltage is 120V.
First, convert watts to amperes:
Current (A) = Power (W) / Voltage (V) = 100 / 120 ≈ 0.833A
Then calculate power consumption:
Power (kWh) = (120 × 0.833 × 5) / 1000 ≈ 0.5 kWh
So, the light bulb consumes approximately 0.5 kWh of electricity.
Example 2: Electric Vehicle Charging
An electric car charger with 240V voltage draws 16A of current and runs for 8 hours.
Calculate power consumption:
Power (kWh) = (240 × 16 × 8) / 1000 = 30.72 kWh
The electric car charger consumes 30.72 kWh of electricity.
Frequently Asked Questions
What is the difference between power and energy?
Power is the rate at which energy is used or transferred, measured in watts (W). Energy is the total amount of power used over time, measured in kilowatt-hours (kWh).
How do I measure voltage and current?
You can measure voltage using a voltmeter and current using an ammeter. These tools are commonly found in electrical toolkits or can be purchased separately.
What units are used for power consumption?
Power consumption is typically measured in kilowatt-hours (kWh), which represents the amount of energy used over one hour at a rate of one kilowatt.