Transformer Voltages and Turns Ratio Quiz

Complete the following sentences. A transformer can be used to change ​​ (a)   voltage. A step-down transformer will ​ (b)   the voltage, while a step-up transformer will ​ (c)   it.

• AC
• DC

• decrease
• increase

Answer explanation

A transformer can be used to change AC voltage. A step-down transformer will decrease the voltage, while a step-up transformer will increase it.

What is the turns ratio of the transformer? Use the circuit diagram of a step-down transformer provided to answer this question.​

If the primary voltage Vp is 40 V AC, what would you expect the voltage Vs to be across the secondary winding? Use the circuit diagram of a step-down transformer provided to answer this question.

Use this circuit diagram of a step-up transformer with a tapped secondary winding to answer the next two questions. If the transformer has a turns ratio of 0.2, what would you expect the voltage Vp to be across the primary winding?

Use this circuit diagram of a step-up transformer with a tapped secondary winding to answer the next two questions. If the voltage across S1 is 85 V AC, what is the voltage across S2?