Question

The secondary of a transformer supplies (1.40x10¹) A to an electric motor. The transformer primary has 350 turns and its secondary has 50 turns. What is the current at the input of the transformer? .

Answer 1

To find the current at the input of the transformer, one uses the transformer turns ratio formula involving the primary and secondary turns and currents. Applying the formula, it is found that the input current for the transformer with the given parameters is 2 A.

Step-by-step explanation:

The transformer has 350 turns on its primary and 50 turns on its secondary. To find the input current at the primary, we use the concept that the transformer's power output (secondary side) is equal to its power input (primary side) under ideal conditions (without considering losses). The relationship of current and number of turns between primary (P) and secondary (S) is given by the formula: IP x NP = IS x NS, where I denotes current and N denotes the number of turns. Using this formula, we can solve for the primary current (IP): IP = (IS x NS) / NP = (14 A x 50 turns) / 350 turns = 2 A. Therefore, the current at the input of the transformer is 2 A.