# Design

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Design 2020-01-02T19:45:45+00:00

## Heating Element Design Basics Nichrome A (80), Nichrome C (60)

### Ohm’ Law Formulas:

• Volts = Amperes X Ohms
• Amperes = Volts/Ohms
• Ohms = Volts/Amperes
• Watts = Volts X Amperes
• Watts = (Volts X Volts) / Ohms
• Watts = Amperes X Amperes X Ohms
• Ohms = Watts / (Amperes X Amperes)

Please see the various tables referred to in this section at:

Nichrome Technical Data Page

Note the amperage values in the Current/Temperature Table in the “Nichrome and Resistance wires” menu item above.  As a general rule you can expect that the amperage value for a *coiled* wire is roughly 30-60% less than the capacity of a *straight* wire as referred to in the table.  For *coiled* wire elements see “Nichrome Wire Tech Tips” PDF file. (accessible in scroll down menu above in “Nichrome and Resistance Wires.”)

Using Ohm’s Law above, & tables (see the Increased Resistance Table), you can calculate the watts at your intended voltage (115 being most common).

See the Wattage/Amperage/Hot Ohms Table. Note that it is based on 115 V.

Taking into account the available space, you can select a wire size that will provide the required wattage. From the amount of total Hot Ohms of your element design, you can use Ohms/Ft Table to estimate the amount of feet you will need of a given size.

## General Design Tips

Use this information as a guide only. The finished element should be thoroughly tested to verify that the rise in resistance with temperature has been properly accounted for.