Transformer windings and voltage

AI Thread Summary
A transformer with a primary coil of 200 windings and a secondary coil of 800 windings connected to a 12 V car battery results in 0 V across the secondary coil because transformers only operate effectively with alternating current (AC). The voltage transformation ratio applies to AC, where the output voltage is proportional to the turn ratio; in this case, it would suggest a potential of 48 V. However, since a car battery provides direct current (DC), the transformer does not function as intended, leading to no voltage increase. The discussion highlights the importance of understanding the type of current when considering transformer operation. Therefore, the key takeaway is that transformers require AC to produce a voltage change based on winding ratios.
sparkle123
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A transformer is constructed with 200 windings on the primary coil, and 800 windings on the secondary coil. The primary coil is connected to a car battery with a potential difference of 12 V. After a few seconds, what is the voltage across the secondary coil?

The answer is 0, but why? I thought that 4 times the windings on the secondary coil would result in four times the voltage...so the answer would be 48 V. Where am I wrong? Thanks!
 
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What kind of power does a car battery supply? Also, how does a transformer work? Think about that for a while and it might help...
 
Ah well a battery would be DC and I think that the voltage is only proportional to turn ratio for AC transformers. I don't know how DC transformers work :$
 
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