step-up transformer:
A transformer in which the output(secondary)voltage is greater than its input(primary)voltage is called a step-up transformer.step-down transformer:
A transformer in which the output(secondary) voltage is less than its input (primary) voltage is called a step-down transformer.
The same transformer can be used as a step-up transformer or a step -down transformer depending on the way it is connected in the circuit.when the transformer is used as a step-up transformer,the low voltage winding is the primary. in a step-down transformer,the high-voltage winding is the primary.
A transformer may receive energy at one voltage and deliver it at the same voltage.such a transformer is called a one-to-one(1:1)transformer. for a 1:1 transformer T1=T2 and |E1|=|E2|.such a transformer is used to isolate two circuits.
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