Devices that increase or decrease the voltage of alternating current. Consists of 2 coils wrapped around an iron core. The two coils are insulated in such a way that no current can flow from one coil to the other. AC current passes through first coil, inducing a current in second wire. The phenomenon of changing the current in a coil to induce a voltage and a current in another coil is called mutual induction..
Types of Transformers
Step-up transformers (Increases Voltage)
Is a transformer which has the output voltage greater than the input voltage due to Ns > Np.
Step-down transformers (Decreases Voltage)
Is a transformer which has the output voltage smaller than the input voltage due to Ns < Np.
How to build a simple transformer??
In figure above, the primary coil is connected to an a.c. power supply and the secondary coil is connected to a load such as a light bulb.
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