1.

What is the emf equation for transformer? 

Answer»

Always maximum flux reaches from zero to maximum in one quarter of the cycle. 

That is in … of second. That is equal to 1/200 second.

Average rate of change of flux = Qm / … f. 

= Qm * 4 * f. = 4 f Qm Weber / second.

As the coil has N turns the average emf induced in the coil = 4 f Qm N volts. 

But the rms. Value = average value * form factor. 

∴ rms. Value of emf = 1.11 * 4 f Qm N volts. 

= 4.44 f Qm N volts. 



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