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Unformatted text preview: Have you ever seen a transformer? Maybe you often use a transformer in your daily life. So you must be familiar with it. We can define a transformer like this ： A transformer is a device that transfers electrical energy from one circuit to another cir cuit through inductively coupled electrical conductors. All transformers have at least one coil ； most have two although they may have many more. The usual function of transformers is to change the level of voltage. In fact, standard power transformers have two coils. These two coils are labeled PRIMARY and SECONDARY separately. And the primary coil is the one connected to the source. The secondary is the one connected to the load. You must notice ： there isno electrical connection between the primary and secondary. Actually, the seconda rygets its voltage by induction.- 192 -...
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