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Voltage and Turns Ratio

<^< Phase | Course Index | Examples: Voltage and Turns Ratio >^>(:nl:)

The voltage produced across a transformer winding is directly proportional to the number of turns on the winding. Thus:

V'_P_'/V'_S_' = N'_P_'/N'_S_'

where V'_P_' is the primary voltage, V'_S_' is the secondary voltage, N'_P_' is the number of turns on the primary winding and N'_S_' is the number of turns on the secondary winding.

The ratio of primary to secondary turns on a transformer, N'_P_'/N'_S_' , is known as the turns-ratio of the transformer.

Finally, the turns-per-volt rating for a transformer is sometimes quoted. This rating is given by:

t.p.v. = N'_P_'/V'_P_' = N'_S_'/V'_S_'

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ratio = 1:2 ratio = 1:1 ratio = 2:1

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