A copper made resistive element with a radius of 2000 µm and a length of XZ mm, as shown in fig a, consists of a resistance with a cross-section area A, length I and a resistivity p. 250 COM Material (p) A E System p = Ohm.m at T = 20°C | = length in meter A = area in square meter R = P A fig: a fig: b Material p Ohm.m @20°C Silver 9.9 Copper 10.37 Gold 14.7 Fig b shows the ammeter reading to be 12.5 mA. Using the resistivity value from the index find out the supplied voltage E (in Volts). HINT: Area of a circle = ar. Start by finding out the cross-section area, A. In fig b, consider the entire system to be the resistive element. b) What is the maximum permissible current in a 1202, 2 W resistor? What is the maximum voltage that can be applied across the resistor.

A copper made resistive element with a radius of 2000 µm and a length of XZ mm, as shown in fig a, consists of a resistance with a cross-section area A, length I and a resistivity p. 250 COM Material (p) A E System p = Ohm.m at T = 20°C | = length in meter A = area in square meter R = P A fig: a fig: b Material p Ohm.m @20°C Silver 9.9 Copper 10.37 Gold 14.7 Fig b shows the ammeter reading to be 12.5 mA. Using the resistivity value from the index find out the supplied voltage E (in Volts). HINT: Area of a circle = ar. Start by finding out the cross-section area, A. In fig b, consider the entire system to be the resistive element. b) What is the maximum permissible current in a 1202, 2 W resistor? What is the maximum voltage that can be applied across the resistor.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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Question

X=6, Z=1

a)
A copper made resistive element with a radius of 2000 µm and a length of XZ mm, as
shown in fig a, consists of a resistance with a cross-section area A, length I and a
resistivity p.
250
COM
Material (p)
System
p = Ohm.m at T = 20°C
1 = length in meter
A = area in square meter
R = P
fig: a
fig: b
Material
p Ohm.m @20°C
Silver
9.9
Copper
10.37
Gold
14.7
Fig b shows the ammeter reading to be 12.5 mA. Using the resistivity value from the index find
out the supplied voltage E (in Volts).
HINT: Area of a circle = ar. Start by finding out the cross-section area, A. In fig b,
consider the entire system to be the resistive element.
b) What is the maximum permissible current in a 1202, 2 W resistor? What is the maximum
voltage that can be applied across the resistor.

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