A transformer is based on a very simple fact about electricity: when a fluctuating electric current flows through a wire, it generates a magnetic field (an invisible pattern of magnetism) or magnetic flux all around it.
http://www.explainthatstuff.com/transformers.html
No, transformers require AC, they do not work as a transformer when a DC voltage is applied. When AC is applied the ratio of Current to voltage remains the same. So a Transformer which steps up voltage, steps down current. Likewise a Voltage step down transformer steps up current. The only change in power out is losses due to the fact that the materials are real.
https://www.physicsforums.com/threads/how-does-a-transformer-work.9384/
The heat in a transformer is due to copper loss and core loss, neither of which is due to voltage. Copper loss is the I^2R loss due to the current and resistance, and core loss is due to the magnetic material and magnetic field which is also current derived. – Martin Mar 3 '11 at 17:50.
https://electronics.stackexchange.com/questions/11004/how-do-step-up-transformers-work
A transformer is an electrical device that transfers energy between two or more circuits through electromagnetic induction. 1  A varying current in the transformer's primary winding creates a varying magnetic flux in the core and a varying magnetic field impinging on the secondary winding.
https://www.quora.com/How-do-transformers-work
I’m trying to figure out how a step-up transformer works. A step-down transformer is simple and logical enough; you start out with a higher voltage and end with less, the remainder being wasted as heat. But with a step-up transformer, you end up with more voltage than you start with.
https://electronics.stackexchange.com/questions/11004/how-do-step-up-transformers-work
Current transformer. A CT for operation on a 110 kV grid. A current transformer (CT) is a type of transformer that is used to measure AC Current. It produce an alternating current (AC) in its secondary which is proportional to the AC current in its primary.
https://en.wikipedia.org/wiki/Current_transformer
A varying current in the primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or voltage, in the secondary winding. This effect is called inductive coupling.
https://www.quora.com/How-do-transformers-work
A transformer changes the voltage of an electric current while transferring it from one circuit to another through electromagnetic induction. Fluctuating magnetic fields in the transformer generate an electric current in a coil of wire, and the voltage they put out is directly proportional to the number of turns in the coil of wire.
https://www.reference.com/science/transformer-work-7c9743a2842b408c
Transformers do not work with direct current (DC), where a steady current constantly flows in the same direction. In general: Secondary voltage ÷ Primary voltage = Number of turns in secondary ÷ Number of turns in primary. Secondary current ÷ Primary current = Number of turns in primary ÷ Number of turns in secondary.
https://www.quora.com/How-do-transformers-work
Secondary voltage ÷ Primary voltage = Number of turns in secondary ÷ Number of turns in primary. The current is transformed the opposite way—increased in size—in a step-down transformer: Secondary current ÷ Primary current = Number of turns in primary ÷ Number of turns in secondary. So a step-down transformer with 100 coils in the primary and 10 coils in the secondary will reduce the voltage by a factor of 10 but multiply the current by a factor of 10 at the same time.
http://www.explainthatstuff.com/transformers.html
how does transformer work
A transformer changes the voltage of an electric current while transferring it from one circuit to another through electromagnetic induction. Fluctuating magnetic fields in the transformer generate an electric current in a coil of wire, and the voltage they put out is directly proportional to the number of turns in the coil of wire.