Effective resistance of secondary circuit in transformers

AI Thread Summary
To reduce a primary voltage of 150 V to a secondary voltage of 25 V, the transformer requires 22 windings in the secondary circuit. The effective resistance of the secondary circuit is calculated using the formula Reff = R(N1/N2)^2, where R is the load resistance. Despite using this equation, there is confusion regarding the calculation, as the expected effective resistance is not matching the derived value of 1500. The discussion highlights the importance of correctly applying the transformer equations and understanding that secondary circuit resistance depends solely on the load. Clarification on the calculations and formulas used is needed to resolve the discrepancy in the effective resistance.
sarah68
Messages
2
Reaction score
0

Homework Statement


You need a transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55 ? resistor. (a) How many windings should the secondary circuit contain? (b) What is the effective resistance of the secondary circuit?

Homework Equations



V2/V1=N2/N1

Reff= R(N1/N2)^2

The Attempt at a Solution



I solved part A. N2 is 22 windings. However, part B is 1500 but I can't seem to get that answer! I used the above equation but it doesn't give me that answer. Is the Reff equation that I'm using wrong? Please help me!
 
Physics news on Phys.org
i think you got the secondary circuit voltage and windings also. you its correct secondary circuit resistance is depend on load only.
 
Yes, but if I plug in the values with that equation I don't get 1500 for part B. I don't know what I'm doing wrong.
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

Are there 2 correct answers to this transformer homework problem?
Replies
33
Views
4K
Transformer question (between substation and home)
Replies
1
Views
1K
What is the current flowing through the wires?
Replies
2
Views
2K
Why is the output current of a transformer fixed?
Replies
22
Views
4K
Current and Impedance in a Transformer
Replies
4
Views
4K
Equivalent resistance of a circuit
Replies
3
Views
2K
An ideal (lossless) transformer has 4 times as many turns
Replies
1
Views
2K
Solving Transformer Problems: Primary and Secondary Coils
Replies
2
Views
2K
What Happens to Primary Voltage if 8V is Applied to Secondary Coil?
Replies
1
Views
2K
Confused on amperes in primary & secondary circuits
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top