Electrical Energy
Calculator and formulas for calculating the electrical energy
This function calculates the relationship between electrical energy, power and time.
To perform the calculation, use the radio button to select which value should be calculated. Then enter the required values and click the 'Calculate' button.
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Electrical energy formulas
Electrical energy is the electrical power measured over a certain period of time. It can be expressed in watts / second or kilowatts / hour.
To calculate electrical energy, use the following basic formulas:
Electrical energy
\[\displaystyle Energy= Power · Time\] \[\displaystyle E=P·t\]
If the power \(P\) is not given, it can be calculated using the formula:
\[\displaystyle E=U·I·t\]Electrical power
\[\displaystyle P=\frac{E}{t}\] \[\displaystyle P=U·I\]Period
\[\displaystyle t=\frac{E}{P}\]
- \(E\): Electrical energy (in joules (\(J\)) or kilowatt hours (\(kWh\))
- \(P\): Electrical power (in watts (\(W\)) or kilowatts (\(kW\))
- \(t\): Time during which the power is delivered in seconds (\(s\)) or hours (\(h\))
- \(U\): Voltage (in volts (\(V\))
- \(I\): Current (in amperes (\(I\))
Example
A light bulb with a power of 100 W lights up for 5 hours. How much Energy is consumed?
\[E=P· t=0.1kW · 5h=0.5kWh\]
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