What are the differences between ac and dc meters? Can you compare the value of the current in the load resistance for the same value of voltage with ac and dc supply? What is the function of the autotransformer in this circuit? Can you use an autotransformer to obtain variable output voltage from a fixed dc supply? What will happen if dc meters are used instead of ac meters in this circuit? What the difference between resistance and impedance is when referred to dc and ac measurements?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter27: Single-phase Transformers
Section: Chapter Questions
Problem 5RQ: What is an autotransformer?
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What are the differences between ac and dc meters? Can you compare the value of the current in the load resistance for the same value of voltage with ac and dc supply? What is the function of the autotransformer in this circuit? Can you use an autotransformer to obtain variable output voltage from a fixed dc supply? What will happen if dc meters are used instead of ac meters in this circuit? What the difference between resistance and impedance is when referred to dc and ac measurements?

LO
L
A
Auto
Supply Transformer
NO
N
Figure 2.1 Circuit Diagram
Transcribed Image Text:LO L A Auto Supply Transformer NO N Figure 2.1 Circuit Diagram
Case (1): Fixed load resistance, Variable supply voltage
SI. No.
V: Volts
I: Amperes
Z: Ohms
1.
100V
0.9A
111.11 Q
2.
120V
1.1A
109.09 Q
3.
140V
1.28A
109.375 Q
4.
160V
1.45A
110.34 Q
5.
180V
1.58A
113.92 Q
6.
200V
1.6A
125 Q
Table (2). Data recorded for VI Measurement- Fixed load resistance
Case (2): Fixed supply voltage, Variable load resistance
SI. No.
V: Volts
I: Amperes
Z: Ohms
1.
150V
0.7A
214.28 Q
150V
1.35A
111.11 Q
3.
150V
1.8A
83.33 Q
4.
150V
2.68A
55.97 Q
5.
150V
3.25A
46.15 Q
Table (3). Data recorded for VI Measurement- Fixed supply voltage
2.
Transcribed Image Text:Case (1): Fixed load resistance, Variable supply voltage SI. No. V: Volts I: Amperes Z: Ohms 1. 100V 0.9A 111.11 Q 2. 120V 1.1A 109.09 Q 3. 140V 1.28A 109.375 Q 4. 160V 1.45A 110.34 Q 5. 180V 1.58A 113.92 Q 6. 200V 1.6A 125 Q Table (2). Data recorded for VI Measurement- Fixed load resistance Case (2): Fixed supply voltage, Variable load resistance SI. No. V: Volts I: Amperes Z: Ohms 1. 150V 0.7A 214.28 Q 150V 1.35A 111.11 Q 3. 150V 1.8A 83.33 Q 4. 150V 2.68A 55.97 Q 5. 150V 3.25A 46.15 Q Table (3). Data recorded for VI Measurement- Fixed supply voltage 2.
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