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2 attatchments for whole problem

2 attatchments for whole problem

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Question 4.)  2 attatchments for whole problem!  figure 6-28

**Text Description:** "When both switches S₁ and S₂ are closed, all resistance is bypassed, and the motor is connected to full power." **Diagram Explanation:** The diagram illustrates an electrical circuit involving an armature, a series field, and a shunt field, all powered by a 250 VDC source. It includes two resistors (Resistor 1 and Resistor 2) and two switches (S₁ and S₂). - **Resistor 1 and Resistor 2**: These are connected in series with the switches S₁ and S₂. - **Switches (S₁ and S₂)**: When both are closed, they bypass the resistors, allowing full power to reach the motor. - **Armature**: This component is placed in series with the fields and receives power when the circuit is closed. - **Series Field and Shunt Field**: These are components of the electrical circuit influencing the armature’s operation. - **250 VDC**: The direct current power source energizing the circuit. **Figure Reference:** "FIGURE 6-28: Determine the resistance and power rating of the two series resistors."
Transcribed Image Text:**Text Description:** "When both switches S₁ and S₂ are closed, all resistance is bypassed, and the motor is connected to full power." **Diagram Explanation:** The diagram illustrates an electrical circuit involving an armature, a series field, and a shunt field, all powered by a 250 VDC source. It includes two resistors (Resistor 1 and Resistor 2) and two switches (S₁ and S₂). - **Resistor 1 and Resistor 2**: These are connected in series with the switches S₁ and S₂. - **Switches (S₁ and S₂)**: When both are closed, they bypass the resistors, allowing full power to reach the motor. - **Armature**: This component is placed in series with the fields and receives power when the circuit is closed. - **Series Field and Shunt Field**: These are components of the electrical circuit influencing the armature’s operation. - **250 VDC**: The direct current power source energizing the circuit. **Figure Reference:** "FIGURE 6-28: Determine the resistance and power rating of the two series resistors."
**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 minimum power rating of each resistor. Refer to Figure 6–28. When both switches S₁ and S₂ are open (off), both resistors are connected in the armature circuit, limiting current to 50% of its normal value. When switch S₁ is closed, it causes the current to bypass resistor 1. Resistor 2 now limits the current to 85% of the full-load current.
Transcribed Image Text:**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 minimum power rating of each resistor. Refer to Figure 6–28. When both switches S₁ and S₂ are open (off), both resistors are connected in the armature circuit, limiting current to 50% of its normal value. When switch S₁ is closed, it causes the current to bypass resistor 1. Resistor 2 now limits the current to 85% of the full-load current.
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