# Electric Power measurement vs electrical energy measurement-Difference between electric power measurement and electrical energy measurement

This page compares electric power measurement vs electrical energy measurement and mentions difference between electric power measurement and electrical energy measurement.

## Electric Power measurement

Power dissipation of DC circuit is expressed as follows.

➨ P = V*I, P = V^{2}/R, P = I^{2}*R

Where,

V = Potential Difference in volts (rms)

I = Current in Amperes

Power dissipation of AC circuit is expressed as follows.

➨ Average Power, P = V*I*cos(φ)

Where,

cos(φ) = Power Factor

φ = angle between voltage(rms) and current (rms)

Following section mentions how to do electric power measurement as described in the above equations.

Electric power is proportional to energy consumption per unit of time.

➨Power = Energy/Time

In other words, 1 Watt = 1 Joule/Sec.

**Electric Power measurement** is done using watt meter or power meter or power analyzer or digital oscilloscope or
using voltmeter/Ammeter.

## Electrical Energy measurement

Energy can be expressed as shown in the above equations.
From the equations it is imperative that

➨Energy = Power x Time

For example, We use 20Watt bulb for 1 Hour i.e. 3600 sec,

Total Energy consumption will be 20 x 3600 = 72000 Joules.

**Electrical energy measurement** is dependent on electric power measured in watts.
It can be done using energy meter or smart electricity meters.

## Links to useful Measurements

Following are the links to other useful measurements available on Test and Measurement World website.

Difference between EVM vs subcarriers and EVM vs symbols

Current measurement vs Voltage measurement

Inductance measurement vs Capacitance measurement

Difference between Power and Energy measurements

EMC measurement vs EMI measurement

Electric and Magnetic Field Measurements

## What is difference between or comparison between

Following links mention difference or comparison between various equipments:

comparison between VSG and VSA

DIfference between SNA ans VNA

Oscilloscope Bandwidth versus Rise time

Oscilloscope vs Logic Analyzer

Difference between Oscillscope types

Comparison between spectrum and network analyzer