How to Measure Power


Power is a physics term used to describe the average amount of energy that is transferred per unit of time. Thus power is expressed in units that are units of energy divided by units of time, the most commonly used of these units being Watts. Measuring electrical power is a matter of measuring its individual components and then performing a relatively simple calculation.

Things You'll Need

  • Electrical multimeter
  • Use the multimeter to measure the voltage in the circuit and record the value in Volts. We will call this value "V."

  • Use the multimeter to then measure the current in the circuit and record the value in Amperes. We will call this value "A."

  • Substitute the values for "V" and "A" into the equation to calculate power in a circuit using voltage and current and calculate.
    P (power) = V*A

  • For example, in a circuit with a voltage of 120 Volts and a current of 20 Amperes, the power is equal to 120 times 20, or 2400 Volt-Amperes.

  • Convert the Volt-Amperes to Watts to properly express the result in power units. Expressing your voltage and current in Volts and Amperes respectively makes this an easy job because 1 Volt-Ampere = 1 Watt. So for the above example, the power is 2400 Watts.

Related Searches


Promoted By Zergnet



You May Also Like

  • What Is Unit of Electrical Power?

    The watt, the main unit used to measure electrical power, was named for James Watt, a British engineer and inventor. It is...

  • How do I Measure Ocean Wave Energy?

    Ocean waves have a powerful influence on both marine life and the planet's climate. The wind forms waves that travel easily across...

  • How to Calculate Power in Watts

    A watt is a calculated unit for measuring electrical energy demand. If your appliance manufacturer label doesn’t state the watts the appliance...

  • How is Power Measured?

    Power is an expression of an amount of work, or energy transferred, in a unit of time. Power itself is not directly...

  • How to Test an Air Compressor Motor Capacitor

    Air compressor capacitors store electrical energy for later discharge. Capacitors contain two plates that build up and store electricity until the electricity...

  • Cheap Ways to Measure Solar Energy

    Solar energy can be measured in two ways: with a pyrheliometer or pyranometer. A pyrheliometer measures the sun's direct solar energy, while...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!