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Transformers

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Core -describe the construction of a basic iron cored transformer as used for voltage transformations -recall and use the equation (Vp / Vs) = (Np / Ns) -describe the use of the transformer in high- voltage transmission of electricity -give the advantages of high voltage transmission

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**Extended -describe the principle of operation of a transformer**

-recall and use the equation Vp lp = Vs Is (for 100% efficiency) -explain why energy losses in cables are lower when the voltage is high

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**Electromagnetic Induction Transformers**

You should learn: A changing magnetic field from one coil can induce an e.m.f. in another coil The parts of a transformer How to do transformer calculations Why transformers are used for power distribution.

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**Parts of a simple transformer**

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**Some equations = Vp x Ip=Vs x Is Power = V x I = I2R = V2/R**

Secondary voltage = number of turns on secondary Primary voltage number of turns on primary And if transformer is 100% efficient Vp x Ip=Vs x Is Power = V x I = I2R = V2/R

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