The nature of electronics highly involves simplification of certain terms to understand and use them correctly. Measurements and conversion of units is an essential part of electronics.

We are going to dive into something just like that. Conversions are very interesting in electronics. One such is Ampere-Hours (Ah) to Kilowatt-Hours (kWh).

Let’s have a look at how it is done by understanding the Kilowatt Hours.

• What is the Kilowatt Hours?

Before going into the deep briefing of Kilowatt Hours, let’s get familiar with the following basic terms.

• Kilo

We all are familiar with the basic term of ‘kilo’ in the unit system. The SI unit system denotes kilo by its symbolic representation ‘k’. The term is used when any value gets multiplied by thousands (103), which comes from its Greek meaning. The term is commonly used in weighing systems domestically as a prefix unit.

• Watt

It doesn’t need an introduction as the unit of Power is named after the inventor of the Steam engine – James Watt.

The symbolic representation of Watt is an uppercase W. Watt is an SI derived unit which is an indication of power i.e. rate of work performed in an electrical appliance.

Mathematically represented as

1 W = 1 J/ 1 S

Or,

1 W= 1 V x 1 A

- Kilowatt and Kilowatt Hours

What we are going to learn here is a combination of the above-explained terms – Kilowatt and Kilowatt-hours. - Kilowatt

The measurements dealing with power makes use of the Kilowatt unit. The standard symbol used for it is kW. The term can be described as,

1 kW measures the amount of energy (1000 J) consumed by an electrical device in a given time (1 sec). It can be said that kilowatt measures the power consumed by devices.

1 kW= 1000 W

1 kW = 1000 J / 1 s - Kilowatt-hours

Till now we have seen, every basic term stands as a standard unit to something. Similarly, the Kilowatt-hour is a standard unit that is specifically assigned for energy. It is the non- SI unit, Joule being the standard derived unit for energy.

The full form to the acronym kWh or kW-h is Kilowatt-hours. If energy is being consumed for a period of time with the time rate being constant, then the energy measured in Kilowatt-hours will be equivalent to the product of power(in kW) and time (in hours).

The following is a mathematical representation,

1 kWh = 1 kW x 1 h

1 kWh = 3.6 x 106 J

Example – An electrical device with 12 kWh of energy.

Has it ever occurred to you that kilowatt and Kilowatt-hours are one and the same? It has happened to me uncountable times. Let me fill you in that is not the case, they may seem a perfect potato-potahto thing but they are not.

The monthly electricity bills that come are no less than a nightmare. They are the epitome of how these terms work.

Kilowatt means that the rate at which electricity is being used whereas Kilowatt-hour tells you the total consumption of energy in a time period of 1 hr.

For eg, 1 kWh will be described as the amount of energy or electricity used at a constant rate of 1kW.

• Relation and formula for conversion of kWh to Ah

The given below equation will get the Ampere-Hours converted into Kilowatt-hours. By their respective definitions, we know that they give the measure of electric charge and electrical energy respectively.

KWh = (Ah x V) / 1000

Also Check for kWh to Ah and KW to Amps Conversions

With the existence of the above formula, it becomes very easy to convert a given value of Ampere hours (Ah) to Kilowatt hours (kWh).

Follow the given steps for easy conversion –

- The first and foremost step is to get yourself a calculator if you want to avoid any mathematical errors or save your time.
- According to the relation given above, get the values of all the symbols used in the equation. As mentioned, voltage is mandatory for the conversion.
- If you are doing the conversion for any appliance, get the readings from the label behind the power chord.
- After finding the value for ampere- hours, find the value of volt used in your country. It is important as different countries use different voltage standards. In the USA it is 120 V but India and most countries use 220 V.
- Now it is time to use the equation and substitute the values. According to the equation, you will multiply the value of Ampere-hours by the voltage value to get the Watts.
- The result must be divided by 1000 in order to the Kilowatt-hour.
- If you are interested in knowing the value when a device is used for a period of time, say 12 hours, multiply 12 with the derived Kilowatt-Hour value.

Ampere-Hours to Kilowatt-Hours conversion are necessary to derive the total energy consumption of a device. To understand electricity, these conversions come handy as electricity ultimately carries energy. That energy is calculated through conversions.

If we understand well about Kilowatt-hours, we may volunteer towards low credit or debit balance. I support this as by paying attention to their definitions we can lower our electricity costs. The bills are supported with measurements in kWh and kW. The former will give the energy consumption readings and the latter about power consumption. If we analyze the rate at which energy is consumed, when and for how long we can do something to reduce it.

If consumption is less, so will be the costs.