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A resistance, used alone, will reduce the tension from that circuit.
However, in my country, the law says sometjing like this:"it is forbiden to reduce the voltage in a circuit by using a resistance !". Since the resistor will heat it self [P=R*I(^2)] it became a danger - a fire can occur.
Wish you the best!
There is a voltage drop happen in primary voltage (V1) so the secondry transformer voltage (v2) wil be lower than its rate
eg. if the transformer rate is from24 V to220 V
24 volt will be say20 Volt after add resistance
and the secondry will be185 V
Two things can happen in connecting a resistance in series with the transformer primary winding. adding a resistor crates voltage drop in it, reducing the primary voltage at the terminals. Hence secondary output will be less.
Secondly the resistor gets heated up, hence it is not advisable to connect the same to reduce output voltage. Increasing primary resistance increase the inductive reactance, which reduce the magnetizing current, which leads to insufficient core magnetization.
It distorts the sinusoidal voltage of the transformes's sec winding