Question

If a resistor is added to a series circuit, the equivalent resistance:1) increases2) decreases3) remains the same4) becomes zero

Answer 1

The equivalence resistance of resistors connected in series is given by the sum of the resistance of individual resistors.

For example, if three resistors say, Q, R and S are in series, then their resistance is given by,

`R_(eq)=Q+R+S`

If we add another resistance, say, T in series with these resistors, then the equivalence resistance will be,

`R_(eq)=Q+R+S+T`

This adding another resistor in series with a circuit increases the equivalent resistance.

Thus the correct answer is option 1.