The most basic electrical formula there is: Volts x Amps = Watts.

## Basic Formulas for Measuring Watts vs Amps vs Volts

Watts is a measurement of how much power something uses in the terms of voltage and current (Amps). Amps measures current. If you compare electricity to water flowing in a pipe, voltage is the amount of pressure while amperes is the amount of volume. An object does not run on current alone or for that matter, voltage alone. An object requires both voltage and current (Amps). The amount of power an object produces varies. So that is where Watts come in.

To Calculate Watts vs Amps vs Volts you will need the basic formulas.

Watts x 1000 = kilowatts (Kwh)~ the measurment used by your Utility company. They charge in Kilowatts which is watts x 1000 = a kilowatt

Volts x Amps = Watts

Watts divided by Volts = Amps

You will need 2 numbers to figure the amount of current.

You need to configure this to determine the size of wiring to connect your batteries, solar array as well as wiring to the gird.

**Use the following formula for all electrical devices~**

Watts of device x 24 hours per day = Daily Watt Usage.

Daily Watt Usage x # of days in month = Monthly Watt Usage.

Watts divided by 1,000 = Kilowatts.

Kilowatts x the Kilowatt rate charged by the power company = the Monthly Operation Cost of that Device~

An inappropriate size on any component will diminish the production of your components. Size does matter.

There is one area that it is important to understand the difference between Watts vs Amps vs Volts and that is the area of solar energy. If you were to implement a system of PV solar panels, you would need to calculate the amount of wattage your household uses in order to figure the number of panels you would require.

**Download Calculators**:

Photovoltaic System Calculator

Energy Usage Assessment Calculator

Continue to explore the videos upon this site for additional clarification.

### Amps, volts, watts...SEE what it really is all about.

**Where to Purchase Kill-O-Watt Meters**

** More Kill-O-Watt Meters Here ~ **

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I’m planning buy a battery 13 volts the plant is to use 20 watts for 2 hours how big should i buy the battery ? any suggestion thanks.

I need more info, but on what you gave me I would recommend something rated at about 80 watt hours minimum. A Mid sized motorcycle battery should do fine. For numerous recharges I would go with a lithium or other high dollar battery. A good R/C tech at a hobby shop could probably help you out quite a bit. Again, I really need more data for any meaningful recommendation.

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Thanks, there are also numerous other formulas. Feel free to share with friends.