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## Related Tools

- Current & resistance to power (DC)
- Power & resistance to current (DC)
- Power & current to voltage (DC)
- Voltage & current to resistance (DC)
- Voltage & resistance to power (DC)

## User Guide

Use this calculator to determine the resistance in ohm, kilohm or megohm units of a direct current (DC) electrical circuit with a specified power and current. Two conversion scales show how the resistance will vary when the power or current is changed independently, whilst the other remains fixed with the entered value.

### Formula

The formula used by this calculator to determine the DC electrical resistance from the power and current of the circuit is:

R = P / I²

#### Symbols

- R = Resistance (DC)
- P = Electrical power (DC)
- I = Current (DC)

### Power (P)

This is the electrical power generated in a DC electrical circuit.

### Current (I)

This is the electrical current flowing through the DC electrical circuit.

### Resistance (R)

This is the electrical resistance of the DC electrical circuit with the entered values for power and current.