Electrical Power
Calculators and formulas for calculating the electrical power
This function calculates the relationship between electrical power, voltage and current.
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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Formulas for electrical power
Electrical power is calculated using the basic formula:
\[\displaystyle Power= Voltage · Current\]
\[\displaystyle P=U·I\]
Legend
- \(P\): Electrical power in watts (W)
- \(U\): Voltage in volts (V)
- \(I\): Current in amperes (A)
Other formulas:
If resistance \(R\) or other values are known, there are alternative formulas:
Using Ohm's law: \[\displaystyle P=\frac{U^2}{R}\] or \[P=I^2 ·R\]
For alternating current (AC): \[P=U·I·cos(φ)\]
Voltage:
\[\displaystyle U=\frac{P}{I}\]
Current:
\[\displaystyle I=\frac{P}{U}\]
Example:
A lamp is connected to a voltage of 230 V and draws a current of 2 A. What is the power?
\[P=U·I\;=230V·2A=460W\]
The lamp has a power of 460 watts.
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