Transformer windings and voltage

In summary, a transformer with 200 windings on the primary coil and 800 windings on the secondary coil is connected to a 12 V car battery. After a few seconds, the voltage across the secondary coil is 0. This may seem counterintuitive since one might expect the voltage to be four times as much as the primary coil's due to the four times as many windings, but this is not the case. This is because the voltage in a transformer is only proportional to the turn ratio for AC transformers, not DC transformers like a car battery.
  • #1
sparkle123
175
0
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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  • #2
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...
 
  • #3
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 :$
 

1. What are transformer windings?

Transformer windings are conductive wires wound around a core, used to transfer electrical energy from one circuit to another through electromagnetic induction.

2. What is the purpose of transformer windings?

The purpose of transformer windings is to step up or step down the voltage of an alternating current (AC) signal. This allows for efficient transmission of electricity over long distances and allows for the use of different voltage levels for different applications.

3. How do transformer windings affect voltage?

The number of turns in the primary and secondary windings of a transformer determine the voltage ratio between the input and output. More turns on the secondary winding will result in a higher voltage output, while fewer turns will result in a lower voltage output.

4. What are the different types of transformer windings?

The two main types of transformer windings are primary windings and secondary windings. Primary windings are connected to the input voltage source, while secondary windings are connected to the output load. Other types include autotransformer windings, tertiary windings, and multiple-winding transformers.

5. How are transformer windings insulated?

Transformer windings are typically insulated with materials such as paper, plastic, or enamel to prevent short circuits and ensure safe operation. The type of insulation used depends on the voltage level and application of the transformer.

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