Current in secondary of transformer

In summary, when an ideal transformer with a turn ratio of one is connected to a high impedance load such as an oscilloscope, there would be no current in the secondary. This is due to the secondary EMF being equal to the primary EMF according to Faraday's law. As a result, there is no power transferred to the secondary and it remains in the magnetic field. The power drawn by the primary also depends on the load resistance and may be absent in this case.
  • #1
codems5
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I am trying to get a better understanding of transformers. Assuming the transformer is ideal, and the secondary is connected to a high impedance load such as an oscilloscope, would there essentially be no current in the secondary?

In this case the turn ratio is one. So ideally, the voltages would be equal. However, if there is no current in the secondary, what is happening to the power that is transferred to the secondary? Does it just remain in the magnetic field? Thanks
 
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  • #2
codems5 said:
I am trying to get a better understanding of transformers. Assuming the transformer is ideal, and the secondary is connected to a high impedance load such as an oscilloscope, would there essentially be no current in the secondary?
Correct.

codems5 said:
In this case the turn ratio is one.
No, it is still given by the physical turns ratio n.
codems5 said:
So ideally, the voltages would be equal.
No, the secondary EMF is V_2=nV_1 as usual. Faraday's law specifies the EMF generated in a loop by changing flux. Secondary current flow depends on load resistance, and may be absent as it is in this case.
codems5 said:
However, if there is no current in the secondary, what is happening to the power that is transferred to the secondary? Does it just remain in the magnetic field? Thanks
There is no power transferred to the secondary, so no power drawn by the primary in your case of an ideal lossless transformer.
 
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  • #3
By saying "in this case", I meant the transformer I am working with has a turn ratio of one and thus the voltages would be equal. Sorry for the confusion. However, you answered the rest of my questions. thank you
 

Related to Current in secondary of transformer

1. What is the purpose of the secondary current in a transformer?

The secondary current in a transformer is used to transfer electrical energy from the primary winding to the secondary winding, which then powers the load connected to the secondary side.

2. How is the secondary current related to the primary current in a transformer?

The secondary current is directly proportional to the primary current in a transformer, according to the turns ratio between the primary and secondary windings.

3. What factors affect the secondary current in a transformer?

The secondary current in a transformer is affected by the number of turns in the secondary winding, the load impedance, and the frequency of the alternating current.

4. Can the secondary current in a transformer be greater than the primary current?

No, the secondary current in a transformer cannot be greater than the primary current. Due to the principle of energy conservation, the power output on the secondary side cannot exceed the power input on the primary side.

5. How is the secondary current controlled in a transformer?

The secondary current in a transformer can be controlled by adjusting the number of turns in the secondary winding or by changing the load impedance on the secondary side. The frequency of the alternating current can also affect the secondary current.

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