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Examples: Voltage and Turns Ratio<^< Voltage and Turns Ratio | Course Index | Current and Turns Ratio >^> Example 1:
A transformer has a turns-per-voltage rating of 6. Determine the primary and secondary voltages if the transformer has 1,400 primary turns and 150 secondary turns.
Since t.p.v. = 6, the primary voltage (VP) can be calculated thus: t.p.v. = NP / VP = 1,400 / VP, VP = 1,400 / t.p.v = 1,400 / 6 = 233V Similarly, the secondary voltage (VS) can be calculated from: VS = NS / 6 = 150 / 6 = 25V Example 2:
A transformer has 1,200 primary turns and 100 secondary turns. If the primary is connected to a 220V r.m.s. a.c. supply, determine the secondary voltage
Since VP/VS = NP/NS, VP x NS = NP x VS, therefore, VS = VPx NS / NP, VS = 220 x 100 / 1,200 = 18.3 V Example 3:
A transformer has 660 primary turns and is designed to operate with a 110V a.c. supply. If the transformer is required to produce an output of 10V, determine the number of secondary turns required.
Since VP/VS = NP/NS, VP x NS= NP x VS, NS = NP x VS / VP, NS = 660 x 10 / 110 = 60 turns <^< Voltage and Turns Ratio | Course index | Current and Turns Ratio >^> |