How Many Turns are on the Secondary Coil of a 240V to 15V Transformer?

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To determine the number of turns on the secondary coil of a transformer with a primary coil of 6400 turns and an output of 15V, the voltage ratio formula V1/V2 = n1/n2 can be applied. Given that the primary voltage is 240V, the equation becomes 240/15 = 6400/x. Solving for x yields 400 turns on the secondary coil. This calculation is based on the principle that the voltage ratio is directly proportional to the turns ratio in a transformer. Understanding this relationship is essential for applications involving transformers.
johnabruzzi
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A battery charger which works from the 240 V mains supply contains a transformer which provides an output of 15 V.

What is the number of turns on the secondary coil if there are 6400 turns on the primary coil of the transformer?
 
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Do you know absolutely nothing about this? Does knowing that 240= 15(16) help?
 
As far as I know, for a transformer V1/V2 = n1/n2 where V1 and V2 are voltages and n1 and n2 are numbers of turns on coils. So in this case you have to solve 240/15 = 6400/x. Honestly, I'm not fully certain is this correct, We'll begin electrodynamics next week at school. But anyway, I hope that helps.
 

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