Miss Lila Brekke
Oct 17, 2024
The figure (Figure 1) shows voltage and current graphs for a resistor.
The figure (Figure 1) displays the voltage and current graphs for a resistor. In Part A, I found that the electromotive force (emf) frequency is 25 Hz. In Part B, what is the value of the resistance R? In Part C, please draw the voltage and current phasors for the resistor at t = 15 ms.
2 Answers
R = V/i = 10/0.5 = 20Ω
V(t) = 10cos50πt = 10cos9000t where 9000t is in degrees because 50π rads/sec * 180°/π radians =9000
i(t) = 0.5cos50πt = 0.5cos9000t where 9000t is in degrees
At 15ms V = -7.07 and i = -0.3536A and they are exactly in phase with each other. 9000*15e-3 = 135°
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