What unit used to measure electric energy?

Answer 1

== Current and Power and Energy
== The unit used to measure the flow of electricity, or current, is the ampere (A). The unit to measure power is the watt (W). Energy is measured in Joules (J). Amperes are really a measure of a rate of electron flow (electrons per second), or equivalently, how much charge is passed per second (Coulombs per second). 1 A = 1 Coulomb per second, and 1 electron has a charge of 1.602 * 10-19 Coulombs.
Power is measure in watts. A watt is an amount of energy per second, or Joules per second (1 W = 1 J/s). The number of watts is for an electrical circuit given by the number of amperes times the voltage drop: 1 W = 1 V * 1 A.
A power company supplying electricity wants to know how much energy (that's Joules) you have used. How much power (that's Watts) you use changes during the day... you turn on the toaster or microwave, your power usage goes up, and at night, you power usage goes down. But the amount of energy you use is the sum of that averaged over time (more precisely, it is the integral of your power consumption, or the area under your power consumption curve).
Energy is measured in Joules (in SI units), but power companies use funny units of kilowatt hours (kW hr). Since a watt is just a joule per second (J/s), a kilowatt hour is a measure of energy. Here is how you convert:
1 kW hr = 1000 W hr = 1000 J/s hr = 1000 J/s * 3600 s = 3.6 * 106 J or 3.6 million Joules
The power company doesn't use Joules on your electricity bill because we use a lot of them... instead they use kilowatt hours... but that's just a bunch of Joules.

Answer 2

-- volt

-- ampere

-- coulomb

-- watt

-- watt-second

Alternative answer

'Electricity' is not a quantity, so has no unit of measurement. So, what you are probably referring to is 'energy'. The SI unit of energy is the joule(J). An alternative unit, used by electricity utility companies for the purpose of billing its consumers, is the kilowatt hour (kW.h).

However, the questioner might also be referring to an alternative unit of measurement for energy, the 'unit', which is short for 'Board of Trade Unit' which, in the UK, is the equivalent of a kilowatt hour, and used for billing consumers (e.g. an electricity bill might be based on a price of '15 pence per unit').

So, 1 unit = 1 kW.h

Other 'electrical' units include:

• the unit of electrical current (I) is the ampere
• the unit of electrical charge (Q) is the coulomb
• the unit of potential difference (V) is the volt
• the unit of resistance (R) is the ohm

Another unit is a joule, it's the determination of the mechanical equivalent of heat and the joule-thompson effect. This effect is the conversion of mechanical, electrical or magnetic energy into heat.

Answer 3

Several different units are used to measure electricity:

Electric charge is measured in coulombs (C)

Electric current is measured in amperes (A), amps for short

Electric potential difference (voltage) is measured in volts (V)

Electric power is measured in watts (W)

Electrical energy used is measured in kilowatt.hours (kW.H)

The units most pertinent to consumers are probably kilowatt.hours, voltage and wattage.

Answer 4

There are lots of different units, depending on what aspect of electricity you want to measure. For example:

Volt (for voltage)

Ampere (for current)

Watt (for power)

Ohm (for resistance)

Hertz (for frequency, in AC currents)

A dimensionless number (for the power factor, in AC currents)

Henry (for inductance)

Farad (for capacitance - since this is a very large unit, it is usually used with prefixes micro, nano or pico)

Volt / meter or the equivalent Newton / Coulomb (for electric field)

etc.

Answer 5

-- watt-seconds

-- kilowatt-hours

Further Answer
In SI, all energy is measured in joules (symbol: J).

Answer 6

The international (SI) unit for energy is the joule. However, power companies

usually charge per kWh (kilowatt-hour). 1 kWh = 3,600,000 joule.

Answer 7

The kilowatt hour (kW.h). In the UK, this is equivalent to the 'unit' (named after the 'Board of Trade unit').

Answer 8

usually kilowatt hours