Power Calculator
Calculate power by providing values for voltage (V) and current (I) using the formula P = VI. Ideal for determining the electrical power consumption or generation in various applications. Obtain accurate results for power (P) using this convenient online tool.
DC power calculator
Calculate the power (P) in a direct current (DC) circuit by providing values for voltage (V) and current (I) using the formula P = VI. Ideal for determining the power consumption or generation in DC electrical systems. Obtain accurate results for power using this convenient online tool.
AC power calculator
Calculate the power (P) in an alternating current (AC) circuit by providing values for voltage (V), current (I), and power factor (PF). This calculator uses the formula P = VI cos(θ) where cos(θ) represents the power factor. Ideal for determining the real power consumed or generated in AC electrical systems. Obtain accurate results for power using this convenient online tool.
Energy & power calculator
Calculate energy and power values based on the given parameters. Enter the required values such as voltage, current, time, or energy consumption, depending on the specific calculation you need to perform. This versatile calculator is useful for various applications, including electrical engineering, physics, and energy management. Obtain accurate results for energy and power calculations using this convenient online tool.
What is Power Calculator
A power calculator is a tool that helps you calculate the power (P) in an electrical circuit based on voltage (V) and current (I), or based on voltage and resistance (R), or current and resistance. The formulas for calculating power are as follows:

Power (P) = Voltage (V) x Current (I) This formula is used to calculate power when the voltage and current values are known.

Power (P) = (Voltage (V)^2) / Resistance (R) This formula is used to calculate power when the voltage and resistance values are known.

Power (P) = (Current (I)^2) x Resistance (R) This formula is used to calculate power when the current and resistance values are known.
To use a power calculator, you typically input the known values (voltage, current, and/or resistance) into the appropriate fields or boxes, and the calculator will compute the power value for you.
Some power calculators may also include additional features such as unit conversions or the ability to switch between different power units (e.g., watts, kilowatts, megawatts). Using a power calculator can simplify calculations and help you understand the power relationships in an electrical circuit.
DC power calculation
Voltage (V) calculation from current (I) and resistance (R):
V_{(V)} = I_{(A)} × R_{(Ω)}
Complex power (S) calculation from voltage (V) and current (I):
P_{(W)} = V_{(V)} × I_{(A)} = V^{ 2}_{(V)} / R_{(Ω)} = I ^{2}_{(A)} × R_{(Ω)}
AC power calculation
The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω):
V_{(V)} = I_{(A)} × Z_{(Ω)} = (I×Z) ∠ (θ_{I} + θ_{Z})
The complex power S in voltamps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):
S_{(VA)} = V_{(V)} × I_{(A)} = (V×I) ∠ (θ_{V}  θ_{I})
The real power P in watts (W) is equal to the voltage V in volts (V) times current I in amps (A) times the power factor (cos φ):
P_{(W)} = V_{(V)} × I_{(A)} × cos φ
The reactive power Q in voltamps reactive (VAR) is equal to the voltage V in volts (V) times the current I in amps (A) time the sine of the complex power phase angle (φ):
Q_{(VAR)} = V_{(V)} × I_{(A)} × sin φ
The power factor (FP) is equal to the absolute value of the cosine of the complex power phase angle (φ):
PF = cos φ
Energy & power calculation
The average power P in watts (W) is equal to the energy consumed E in joules (J) divided by time period Δt in seconds (s):
P_{(W)} = E_{(J)} / Δt_{(s)}
Power Calculator Example
Certainly! The power (P) in an electrical circuit can be calculated using the formula:
P = V * I
where P is the power in watts (W), V is the voltage in volts (V), and I is the current in amps (A).
Here's an example that demonstrates using the power formula:
Let's assume we have a circuit with a voltage of 120 volts and a current of 5 amps. We want to calculate the power consumed by the circuit.
Using the power formula: P = V * I P = 120 V * 5 A P = 600 watts
Therefore, the power consumed by the circuit is 600 watts.
This calculation allows you to determine the power consumed or produced in an electrical circuit based on the voltage and current flowing through it.