Solving Transformer Problems: Primary and Secondary Coils

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SUMMARY

This discussion focuses on solving transformer problems involving primary and secondary coils. The transformer in question has 300 primary windings and 804 secondary windings, with a primary voltage of 21.0 V leading to a secondary voltage of 56.3 V. The challenge lies in determining the effective load resistance of the secondary coil when connected to a 145 Ohm resistor. The key insight is that the problem requires calculating the reflected resistance back to the primary winding, which can be approached through energy conservation principles.

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Transformer problem, Please Help!

Please help with this problem.

A transformer consists of 300 primary windings and 804 secondary windings.
a) If the potential difference across the primary coil is 21.0 , what is the voltage across the secondary coil ?
Found this part, Vs = 56.3 V

b) If the potential difference across the primary coil is 21.0 V , what is the effective load resistance of the secondary coil if it is connected across a 145 Ohms resistor?

This part I am not getting. Is it saying that 145 Ohms is Rp (Resistance of the primary coil) ??, or there are more than one resistors for the secondary coil and I need to find the Req. Please help!

Homework Statement

 
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Probably they mean what resistance is reflected back to the primary winding. In other words, what resistance does the 21V source see?

You can deduce the answer from an energy-conservation argument.
 
Thank you!
 

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