WorksheetsTransformer
Total questions: 7
Worksheet time: 4mins
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
The transformer is a device used to .......... the value of a voltage.
steady
resist
change
anchor
Why transformers work with A.C. current but not D.C.
A.C current produces changing magnetic field.
D.C current produces changing magnetic field.
D.C current is weak
A.C current is powerful
Ratio of voltages is equal to ratio of _______________________.
number of iron sheets in core
number of coil
number of turns in coil
number of electromagnetic
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
480V
30V
20V
450V
The function of a transformer is to ...
raise and lower the apparent power levels
transfer DC voltage from the primary winding to the secondary winding
increase or decrease A.C voltage or A.C current levels
transform mechanical energy into electrical energy
An input voltage of 10 V is supplied to the primary coil of a transformer. An output voltage of 40 V
is produced across the secondary coil.
The 10 V supply at the primary coil is now replaced with a 40 V supply.
What is the new output voltage across the secondary coil?
10 V
40 V
70 V
160 V
