# Current gain (for equal impedances)

## Description

The current gain can be calculated using current instead of power using Joule’s first law to calculate. In many cases, the input and output impedances are equal.

Related formulas## Variables

gain_{dB} | Current gain (dB) (dimensionless) |

I_{out} | Output current (dimensionless) |

I_{in} | Input current (dimensionless) |