12. A copper wire of diameter 1 cm had a resistance of 0.15 Q. It was drawn under pressure so that its diameter was reduced to 50%. What is the new resistance of the wire ? * O 3.87 Q O 1.220 O 0.767 Q O 2.4 Q
12. A copper wire of diameter 1 cm had a resistance of 0.15 Q. It was drawn under pressure so that its diameter was reduced to 50%. What is the new resistance of the wire ? * O 3.87 Q O 1.220 O 0.767 Q O 2.4 Q
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter16: Installation Of Heating, Cooling, And Refrigeration Systems
Section: Chapter Questions
Problem 19RQ
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@12&23
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Transcribed Image Text:12. A copper wire of diameter 1
cm had a resistance of 0.15 Q.
It was drawn under pressure
so that its diameter was
reduced to 50%. What is the
new resistance of the wire ? *
O 3.87 0
O 1.220
O 0.767 Q
O 2.4 N
Transcribed Image Text:23. A coil of copper wire has
resistance of 90 Q at 20°C and
is connected to a 230 V supply.
By how much must the voltage
be increased in order to
maintain the current constant
if the temperature of the coil
rises to 60°C? Take for copper
aO = 0.00428/°C. *
O 28.6 V
O 55.9 V
O 40.2 V
O 36.3 V
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