vəˈreɪ.ɪk

Definitions

1. noun

A variable or changing quantity, especially one that can be expressed as a mathematical function.

“The engineer studied the variac’s effect on the circuit’s voltage output.”

2. noun

A device, typically in the form of a variable resistor, used to supply a variable voltage to an electrical circuit.

“The electronics kit included a variac for experimenting with different voltage levels.”