How Transformers Work: Explaining Ohm's Law

[Ahmed Abdullah]

Ohm's law states that at constant temperature the flow of electricity through a conductor is proportion to the potential difference across the conductor. But It always appeared to me that transformers are indifferent to this law. Here, how it is.
A step up transformer induce larger voltage from the primary coil to secondary coil. But the electron flow falls. Primary coil has relatively lower voltage but higher flow of electrons. The secondary coil has vice versa. Does it violate Ohm's law (V=IR)?
Please help.

 

[turbo]

Transformers don't violate Ohm's law. Google on transformer and see why they act the way they do, and pay attention to the way the number of turns in the windings affect the voltage and current flow.

 

[charng]

I can provide an explanation for how transformers work and how they do not violate Ohm's Law. Ohm's Law states that the flow of electricity, or current (I), is directly proportional to the voltage (V) and inversely proportional to the resistance (R) of a conductor. This means that as voltage increases, current also increases, and as resistance increases, current decreases.

In a transformer, the primary coil is connected to a power source and the secondary coil is connected to a load. The primary coil has a certain number of turns and the secondary coil has a different number of turns. When an alternating current flows through the primary coil, it creates a changing magnetic field. This changing magnetic field induces a voltage in the secondary coil, based on the ratio of turns between the two coils.

Now, let's consider Ohm's Law in this scenario. The voltage in the primary coil is determined by the power source, and the current is determined by the resistance of the primary coil. In the secondary coil, the voltage is induced by the changing magnetic field and the current is determined by the resistance of the secondary coil. So, while the voltage and current may have different values in the primary and secondary coils, Ohm's Law still holds true for each individual coil.

In other words, Ohm's Law is not violated in a transformer because it is still valid for each individual coil. The step up transformer you mentioned is simply changing the voltage and current values without changing the fundamental relationship between them.

I hope this explanation helps to clarify how transformers work and how they are not indifferent to Ohm's Law. If you have any further questions, please do not hesitate to ask.