Question

in an electric circuit rheostat is used to change the potential difference B potential C current D none of these​

Answer 1

Answer:

c) current

Explanation:

According to Ohm's law, the voltage across and current through a resistor are proportional.

If one places a variable resistance (rheostat) across a voltage source, the voltage across the rheostat is fixed.

By fixing the voltage across the rheostat, the current through becomes inversely proportional to the resistance:

i(R)=V/R