# Current source and voltage source components

## Introduction

There are two components of source type:

- the current source
- the voltage source

## Current source: definition

A current source is an ideal current source defined by the function current- time
**I(t)** that depends on the physical application, as presented in the table
below.

Application | Function I(t) | Description in Flux |
---|---|---|

Steady state AC |
predefined: I(t) = I |
Rms value: (I Phase: φ |

Transient |
defined by the user: I(t) = … |
Formula: I(t) = … |

## Voltage source: definition

A voltage source is an ideal voltage source defined by the function voltage - time
**U(t)** that depends on the physical application, as presented in the table
below.

Application | Dependence U(t) | Description in Flux |
---|---|---|

Steady State AC |
predefined: U(t) = U |
Rms value: (U Phase: φ |

Transient |
defined by the user: U(t) = … |
Formula: U(t) = … |

## Concerning formulas

The formula that sets the time dependence on the current or on the voltage in a transient application is a formula that comprises:

- constants and I/O (input/output) parameters
- functions (operators, usual mathematical functions, varying functions, …)

Example:

- I(t) = I
_{0}Sin(ω.t + φ) - U(t) = U
_{0}Trapez(t, T_{1}, T_{2}, T_{3})