Discuss the differences between the current coil and voltage coil of a wattmeter from a design point of view.What will be the consequences if the current coil and voltage coil of a wattmeter are interchanged by mistake?What are the possible errors in this measurement?Can you measure power in an ac circuit by using an ammeter and voltmeter? If No, why? If yes, how?What is to be done if the wattmeter reads in the negative direction? Case (1): Resistive load (R)P: WattsSI. No.V: VoltsE AmperescosoQ:VARS:VA(from wattmeter)1.230VOAOWOVA2.230V1A200W230VA3.230V2A450W460VA4.230VЗА700W690VATable (2). Data recorded for Power Measurement- resistive loadCase (2): Inductive load (R-L)P: WattsSI. No.V: VoltsE: AmperescosoQ:VARS:VA(from wattmeter)1.230V0.4A150W1.6VAR92VA2.230V0.8A1150W3.2VAR184VA3.230V1.1A1150W4.4VAR253VA4.230V1.95A1390W7.8VAR448.5VA5.230V2.5A1410W10.04VAR575VATable (3). Data recorded for Power Measurement- inductive loadCase (2): Capacitive load (R-C)P: WattsSI. No.V: VoltsE: AmperescosoQ:VARS:VA(from wattmeter)1.230V0.28A150W1.12VAR64.4VA2.230V0.3A150W1.2VAR69VA3.230V0.75A1150W2.23VAR127.5VA4.230V0.91A1150W3.65VAR209.3VA5.230V1.89A1390W7.59VAR434.7VA6.230V2.35A1390W9.43VAR540.5VATable (4). Data recorded for Power Measurement- Capacitive load AW10A / 300VА0-10AAutoLoadSupply Transformer0-300V230V 50HZ 1ø

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Publisher:Robert L. Boylestad

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Discuss the differences between the current coil and voltage coil of a wattmeter from a design point of view.
What will be the consequences if the current coil and voltage coil of a wattmeter are interchanged by mistake?
What are the possible errors in this measurement?
Can you measure power in an ac circuit by using an ammeter and voltmeter? If No, why? If yes, how?
What is to be done if the wattmeter reads in the negative direction?

Case (1): Resistive load (R)
P: Watts
SI. No.
V: Volts
E Amperes
coso
Q:VAR
S:VA
(from wattmeter)
1.
230V
OA
OW
OVA
2.
230V
1A
200W
230VA
3.
230V
2A
450W
460VA
4.
230V
ЗА
700W
690VA
Table (2). Data recorded for Power Measurement- resistive load
Case (2): Inductive load (R-L)
P: Watts
SI. No.
V: Volts
E: Amperes
coso
Q:VAR
S:VA
(from wattmeter)
1.
230V
0.4A
1
50W
1.6VAR
92VA
2.
230V
0.8A
1
150W
3.2VAR
184VA
3.
230V
1.1A
1
150W
4.4VAR
253VA
4.
230V
1.95A
1
390W
7.8VAR
448.5VA
5.
230V
2.5A
1
410W
10.04VAR
575VA
Table (3). Data recorded for Power Measurement- inductive load
Case (2): Capacitive load (R-C)
P: Watts
SI. No.
V: Volts
E: Amperes
coso
Q:VAR
S:VA
(from wattmeter)
1.
230V
0.28A
1
50W
1.12VAR
64.4VA
2.
230V
0.3A
1
50W
1.2VAR
69VA
3.
230V
0.75A
1
150W
2.23VAR
127.5VA
4.
230V
0.91A
1
150W
3.65VAR
209.3VA
5.
230V
1.89A
1
390W
7.59VAR
434.7VA
6.
230V
2.35A
1
390W
9.43VAR
540.5VA
Table (4). Data recorded for Power Measurement- Capacitive load

A
W
10A / 300V
А
0-10A
Auto
Load
Supply Transformer
0-300V
230V 50HZ 1ø

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