# Figuring Volts Watts and Electrical Amperage

 How to Calculate Electrical Loads and Circuits using Ohms Law: The Most Common Electrical Calculation using Ohms Law

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Understanding and Calculating Electrical Circuit Loads
[ad#block]Electrical Question: I am trying to calculate an electric circuit for my kiln.

• I am making the kiln using Kanthal element wire coils.
• The coil itself is 16 ohms, making 3500 watts, and drawing about 14 amp’s. I wish to have another coil too.
• I know if I add this coil in a parallel connection with 1st coil, I will get more watts at same voltage but will my amperage rise?
• I think it won’t double as I think it would in a series connection and what do you think it would be?
• As I want my kiln to have over 6000 watts heating power but don’t know if the amps will rise too much if I set it up in parallel for my wall plug and I think that is about 20 amp’s or so.
• I get the feeling this will draw about 17 amp’s or so.

Background: David from Brisbane, Australia.

Thanks for your electrical question David.

## How to Calculate Electrical Loads and Circuits using Ohms Law

• David, this all sounds fine, however if you want to be extremely accurate then just use one of the ohm’s law formulas to find out what your electrical load will actually be.

### The Most Common Electrical Calculation of Ohms Law

To find out the Amperage when the voltage and watts or resistance is known simply make this electrical calculation:
Watts / Volts = Amps
Example:
3500 watts / 240 volts = 14.6 amps

#### More about OHMS Law and Electrical Wiring

Ohms Law Formula

Using the Ohm’s Law is a way to determine information needed to understand how to design electrical circuits.

This formula works with three main variables and depending on what is known can produce a missing factor which is needed to determine the circuit size.

The Ohm’s Law is also used when designing appliances and building electrical equipment and devices.

Electrical Wire for the Home
Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.

I was given an old, electric jewelry kiln. It draws 14 amps. No identification available. It fires up to about 1650 degrees F., but the plug would get too hot to touch. We replaced the old 2-plug Continue reading

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2 Responses to “Figuring Volts Watts and Electrical Amperage”
1. Julia k says:

I want to run outdoor patio lights from one outdoor outlet. How far can I run patio lights 3000 watts, 100 feet strings? I’d like to go 300 feet, can I do that on one outlet?

2. Dave Rongey says:

Hi Julia,

The distance an electrical cable may be run to supply power to a device will depend on the following:
What is the voltage of the devices being powered, in this case, the lights themselves.
What is the wire size of the circuit supplying the power.
What is the cable type and that will be installed, and what are the limitations of that cable, such as temperature, amperage, and installation environment.
What will be the method used to install the cable, such as direct burial or in conduit.

One rule of thumb is when the length of the cable will be more than 200 feet the size of the cable is increased, however this does not apply to everything, and again, all of the above factors need to be considered as well.

As you can see, the Device Load, and the Cable Type are Big Factors for any circuit when calculating wire size. This also applies to low voltage lighting as well.

I hope this helps.
Dave