© John Bird Published by Taylor and Francis Neglecting losses, calculate the value of the secondary current. A step-down transformer having a turns ratio of 20:1 has a primary voltage of 4 kV and a load of 10 kW. Calculate the secondary voltage and current. An ideal transformer has a turns ratio of 15:1 and is supplied at 180 V when the primary current is 4 A. Determine how many turns must be wound on the secondary side if an output of 1.66 kV is required.

A transformer primary winding connected across a 415 V supply has 750 turns. An ideal transformer has a turns ratio of 12:1 and is supplied at 192 V. An ideal transformer with a turns ratio 3:8 has an output voltage of 640 V. If the primary voltage is 160 V, determine the secondary voltage assuming an ideal transformer. A transformer has 800 primary turns and 2000 secondary turns. An ideal transformer with a turns ratio 2:9 is fed from a 220 V supply. Determine the number of secondary turns for a 240 V output voltage, assuming no losses. A transformer has 600 primary turns connected to a 1.5 kV supply.

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