TRANSFORMERS.

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Presentation transcript:

TRANSFORMERS

Transformers- used to increase or decrease the voltage Step down transformer- more coils are on the primary than on the secondary. Will decrease the voltage.

Step-up transformer- Used to increase the voltage Step-up transformer- Used to increase the voltage. Has more coils on the secondary. *Transformers work with alternating current only*

FORMULA’S VP NP V-voltage N – number of coils VS NS I – current p ,s subscripts-indicate the primary and secondary coils of the transformer VP NP VS NS VP IP =VS IS %efficiency = power out X 100 power in

EXAMPLE A step-up transformer has 200 coils on the primary and 3000 on the secondary. The primary has a potential difference of 90V. a) What is the potential difference in the secondary? VP NP 90V/ Vs= 200/ 3000 VS NS Vs = 1350V

Pout= 1350V(2Amp) Pout=2700 Watts b) If the current in the primary is 30Amp, what is the current in the secondary? VP IP =VS IS 90V(30Amp)= 1350V(Is ) Is = 2 Amps c) What is the power output of the transformer? Pout = VS IS Pout= 1350V(2Amp) Pout=2700 Watts

Step-up Step-down