# Formula with I/O (input/output) parameters

## Definition

A formula with I/O parameters is an expression that allows handling I/O parameters in different contexts – physics, kinematics, circuit, results post-processing.

## Use

A formula with I/O parameters is used to define:

- another I/O parameter
- the current in a coil, a sensor, …

## Evaluation

The formula is evaluated:

- during the solving process by using information on control of the parameter
- during the evaluation of sensors in the context of results post-processing

## Example

The example below shows the use of a formula in the physical context for a magnetic application.

The value of the current in a coil is given by I = I0 sin(ωt)

The I/O parameter CURRENT_VAL can be expressed as function of other I/O parameters (I0, FREQ, TIME) by using the following formula:

CURRENT_VAL=I0*(2*PI*FREQ*TIME)

## Additional information

Additional information on I/O parameters and corresponding formulas is available in chapter Parametric analysis: principles .