WorksheetsUnderstanding Transformers in Physics
Total questions: 10
Worksheet time: 5mins
Which of the following best describes the main function of a transformer in an electrical circuit?
To convert direct current (DC) to alternating current (AC)
To increase or decrease the voltage of an alternating current (AC) supply
To store electrical energy
To measure electrical resistance
What is the correct transformer equation relating the number of turns and voltages in the primary and secondary coils?
VsVp=NpNs
VsVp=NsNp
Vp×Np=Vs×Ns
Vp+Vs=Np+Ns
Which type of transformer increases the voltage from primary to secondary?
Step-down transformer
Step-up transformer
Isolation transformer
Variable transformer
A transformer has 200 turns on the primary coil and 50 turns on the secondary coil. If the input voltage is 240 V, what is the output voltage?
60 V
120 V
30 V
480 V
Which of the following is NOT a type of transformer?
Step-up transformer
Step-down transformer
Isolation transformer
Induction transformer
If a transformer is ideal and the primary coil has 500 turns with a voltage of 230 V, what should be the number of turns on the secondary coil to obtain 115 V?
1000 turns
250 turns
500 turns
115 turns
Which of the following statements about transformers is correct?
Transformers work with both AC and DC supplies.
Transformers only work with AC supplies.
Transformers only work with DC supplies.
Transformers can store electrical energy.
A step-down transformer is used to reduce the voltage from 400 V to 100 V. If the primary coil has 800 turns, how many turns should the secondary coil have?
200 turns
400 turns
100 turns
50 turns
What is the main purpose of an isolation transformer?
To increase voltage
To decrease voltage
To provide electrical isolation without changing voltage
To convert AC to DC
If the secondary coil of a transformer has 600 turns and the primary coil has 300 turns, and the input voltage is 120 V, what is the output voltage?
60 V
120 V
240 V
600 V
