Key relationship
Vs/Vp=Ns/Np; Pin=Pout/η; ideal Ip/Is=Ns/Np.
Physics · Class 12
Transformer turns ratio
A transformer uses changing shared flux. Raising voltage reduces available current for a given transmitted power. Efficiency accounts for a lumped input-power loss.
Open the interactive experiment →Transformer turns ratio
மாற்றி மாறும் காந்தப்பாயத்தால் இயங்கும். மின்னழுத்த விகிதம் சுருள் சுற்றுகளின் விகிதம்.
Key notes, relationships and model limits
Remember
A transformer uses changing shared flux. Raising voltage reduces available current for a given transmitted power. Efficiency accounts for a lumped input-power loss.
Common trap
A transformer’s voltage gain does not create energy. Higher output voltage requires lower output current in the ideal case.
Model limits
AC transformer, ideal turns-ratio voltage with lumped efficiency affecting input power only. No DC operation, saturation or winding drop.
What you will learn
Use the controls and plotted relation to explain transformer turns ratio.
Try the experiment
Try both scenarios, change one control, and predict the result before checking the graph and readouts.
Think of it this way
Change one input while keeping the others fixed, as you would in a controlled experiment.
Worked example
At 20 V across a 20 Ω load, Is=1 A and ideal Ip=0.2 A from a 100 V source.
Why this matters
The model connects transformer turns ratio with an observable reading. Check the equation and assumptions before applying it.
Before you start
SI units · algebra · graph reading
Check your understanding
With 500 primary turns and 100 secondary turns, 100 V input yields?
- 500 V.
- 20 V secondary RMS voltage.
- 100 V.
Read the explanation
20 V secondary RMS voltage.
Course connection: Class XII Chapter 7. Consult the roadmap for CBSE, NEET, JEE Main and Advanced scope.