?A direct current motor is connected to a 250-volt DC supply. The armature has a current draw of… 1 answer below »

PRACTICAL APPLICATIONS

A direct current motor is connected to a 250-volt DC supply. The armature has a current draw of 165 amperes when operating at full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature current is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armature current is to be limited to 85% of full-load current. Determine the ohmic value and min-imum power rating of each resistor. Refer to Figure 6-26. When both switches SI and S2 are open (off), both resistors are connected in the armature circuit, limiting current to 50% of its normal value. When switch S, is closed, it causes the current to bypass resistor 1. Resistor 2 now limits the current to 85% of the full-load current. When both switches SI and S2 are closed, all resistance is by-passed, and the armature is connected to full power..

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