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Author Question: An AC voltage source has an amplitude of 96. V and frequency 400. Hz. The voltage was zero at t = 0 ... (Read 101 times)

mcmcdaniel

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on: Jul 27, 2018
An AC voltage source has an amplitude of 96. V and frequency 400. Hz. The voltage was zero at t = 0 and was increasing.
 
  (a) What is the effective rms voltage?
  (b) What is the instantaneous voltage at 1.00 ms?
  (c) When will the voltage be 40. V?

Question 2

A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000  at 20C and increases to 3.072  as indium starts to melt.
 
  What is the melting point of indium? (The temperature coefficient of resistivity for platinum is 3.9  10-3/C.) A) 117C
  B) 137C
  C) 157C
  D) 235C
  E) 351C


mammy1697

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Reply #1 on: Jul 27, 2018
Answer to Question 1

(a) 68. V
(b) 56. V
(c) 0.17 ms

Answer to Question 2

C


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