The correct answer is: A. The secondary voltage for a step-down power transformer is greater than the primary voltage.
A step-down transformer is a type of transformer that reduces the voltage in an electrical circuit. The secondary voltage of a step-down transformer is always less than the primary voltage. This is because the transformer’s windings are arranged in such a way that the magnetic flux produced by the primary winding induces a voltage in the secondary winding. The amount of voltage induced in the secondary winding is proportional to the number of turns in the secondary winding divided by the number of turns in the primary winding. Therefore, if the secondary winding has fewer turns than the primary winding, the secondary voltage will be less than the primary voltage.
Option B is incorrect because the secondary current for a step-down power transformer is always less than the primary current. This is because the transformer’s windings are arranged in such a way that the current in the primary winding is transferred to the secondary winding through the transformer’s core. The amount
of current transferred to the secondary winding is proportional to the number of turns in the secondary winding divided by the number of turns in the primary winding. Therefore, if the secondary winding has fewer turns than the primary winding, the secondary current will be less than the primary current.Option C is incorrect because a parallel RLC circuit operated below its resonant frequency has a capacitive reactance that is greater than its inductive reactance. This means that the current in the
circuit will be greater than the current in a purely resistive circuit.Option D is incorrect because a purely resistive circuit has no reactance. This means that the current in the circuit will be equal to the voltage divided by the resistance.
Option E is incorrect because only option A is true.