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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.


Electrical energy calculator

 What should be calculated?
 Input
Energy
Power
Time
Decimal places
 Result
Energy
Power
Time

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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