An autotransformer has a 2:1 turns ratio. A voltage of 480 volts is connected across the entire winding. Since the transformer has a turns ratio of 2:1, a voltage of 240 volts will be supplied to the load. Ammeters connected in series with each winding indicate the current flow in the circuit. It is assumed that the load produces a current flow of 4 amperes on the secondary. A current flow of ____ amperes is supplied to the primary.
A) 2
B) 4
C) 6
D) 12

Question

Quizplus · Accepted Answer

The primary current can be calculated using the formula for an autotransformer: I_primary = I_secondary / turns ratio. Given I_secondary = 4 A and turns ratio = 2:1, I_primary = 4 A / 2 = 2 A.

An Autotransformer Has a 2:1 Turns Ratio