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Primary phase voltage = 2,400 divided by 1.73 = 1,387 V. Secondary phase voltage = 1,387 divided by 10 = 139 V. Secondary line voltage = 139 V multiplied by 1.73 = 240 V.
The primary voltage is equal to the product of the secondary voltage and primary current divided by secondary current. The secondary voltage is equal to the product of the primary voltage and primary current divided by secondary current.
If you take the higher number of turns and divide it by the lower number of turns, you get a ratio. For example: A transformer with 100 turns on the primary and 50 turns on the secondary will have a turns ratio of 2:1. Therefore if 120 volts is on the primary, then 60 volts will be impressed on the secondary.