# Admittance (related to resistance and reactance)

## Description

In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow. It is defined as the inverse of impedance. Resistance is a measure of the opposition of a circuit to the flow of a steady current, while impedance takes into account not only the resistance but also dynamic effects (known as reactance).

Related formulas## Variables

Y | The admittance (siemens) |

R | The resistance (ohm) |

j | root of -1 (j^2 = -1) (dimensionless) |

X | The reactance (ohm) |