Font size
WorksheetsPHYSICS (TRANSFORMERS)
Total questions: 20
Worksheet time: 40mins
The winding of wire around a core which is connected to a source of energy is called the ....... coil.
primary
secondary
tertiary
Calculate potential difference in the secondary coil based on the information given below.
Vp = 240 V
Np = 20
Ns = 125
Vs ?
1500
500
1000
2000
Which of the following is an example of appliance using alternating power source?
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
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
If the transformer shown is 80% efficient, calculate the power at the primary coil.
30W
24W
36.5W
19.2W
Transformer is always connected to ___________ supply.
A.C.
D.C.
For increasing the voltage ___________ is used.
Step up transformer
Step down transformer
Current transformer
A transformer has primary voltage 200V and secondary voltage 100V , the transformer is called _______ .
Step up
Step Down
None
Electrical symbol of a TRANSFORMER
The value of the second winding voltage of an iron-core transformer depends upon the ....... of turns, this winding contains as compared to the number of ........ winding turns.
primary, size
number, primary
size, height
number, size
A transformer consists of
Metal Core
Metal core and coiled wire
Metal core and polymer wire
Polymer core and metal wire
