Enter the voltage and resistance into the calculator to determine the power in kilowatts. This calculator helps in understanding how electrical resistance and voltage affect the power output of an electrical circuit.
Resistance to kW Formula
The following formula is used to calculate the power in kilowatts (kW) from resistance and voltage.
P (kW) = (V^2) / R / 1000
Variables:
- P is the power in kilowatts (kW)
- V is the voltage in volts (V)
- R is the resistance in ohms (Ω)
To calculate the power in kilowatts, square the voltage, divide by the resistance, and then divide by 1000 to convert from watts to kilowatts.
What is Power in Electrical Terms?
Power in electrical terms is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (W), which is equal to one joule per second. Power can be calculated by multiplying voltage by current. In the context of resistance, power can also be determined by using the voltage and resistance of the circuit, as shown in the formula above.
How to Calculate Power from Resistance and Voltage?
The following steps outline how to calculate the power in kilowatts from resistance and voltage.
- First, determine the voltage (V) in volts.
- Next, determine the resistance (R) in ohms.
- Use the formula P (kW) = (V^2) / R / 1000 to calculate the power.
- Finally, enter the voltage and resistance into the calculator to get the power in kilowatts.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Voltage (V) = 220 volts
Resistance (R) = 50 ohms