# Appendix A

# Basic Definition, Hysteresis and Eddy Current Losses

## A.1 RESISTANCE AND RESISTIVITY

Resistance is the property of a substance due to which it opposes the flow of current through it. The unit of resistance is ohm (Ω).

A conductor shown in Figure A.1 is taken length = *l* m and area of cross-section = *a* m^{2}.

If *R* is its resistance, we have

*R* ∝ *l* when *a* is constant.

*R* ∝ when *l* is constant.

*R* ∝ when both *l* and *a* are not constant.

**Figure A.1 ...**