The figure (Figure 1) shows voltage and current graphs for a resistor.

The figure (Figure 1) shows voltage and current graphs for a resistor.

I found part A , emf frequency = 25 Hz

Part B

What is the value of the resistance R?

Part C

Draw the resistor’s voltage and current phasors at t=15ms.

knight_Figure_35_06

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°

  • got it right on masteringphysics..

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