Transformers
- Created by: 13feelliott
- Created on: 22-02-18 17:27
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- Transformers
- How does it work?
- 1) Alternating current passes through the primary coil
- 2) This produces an alternating magnetic field in the core
- 3) The moving magnetic field in the core passes the secondary coil and induces (ie generates) an electrical current in it.
- 4) If both coils are the same and no energy is lost, you get out exactly what you put in.
- 5) If however there are more coils on the output (or secondary) windings, the voltage is stepped up
- 6) With less coils on the secondary than the primary the output voltage is stepped down.
- 7) The RATIO of the number of coils determines the RATIO of the input and output voltages
- 8) So if the voltage goes up the current goes down by the same ratio and vice versa
- Uses of Transformers:
- The National Grid
- Step-up and Step-down transformers
- A transformer that increases the voltage is called a step-up transformer
- Step-up transformers have more turns on the secondary coil than they do on the primary coil.
- A transformer that decreases the voltage is called a step-down transformer
- Step-down transformers have fewer turns on the secondary coil than they do on the primary coil.
- A transformer that increases the voltage is called a step-up transformer
- A transformer is an electrical device that changes the voltage of an AC supply. A transformer changes a high-voltage supply into a low-voltage one, or vice versa.
- Transformers only work if AC is supplied to the primary coil. If DC was supplied, there would be no current in the secondary coil.
- The ratio between the voltages in the coils is the same as the ratio of the number of turns in the coils.
- primary voltage / secondary voltage = turns on primary / turns on secondary
- Vp/Vs = Np/Ns
- How does it work?
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