What is the relationship between current and voltage in a purely resistive circuit?
A. The current lags the voltage by 90°.
B. The current leads the voltage by 90°.
C. The current and voltage are 180° out of phase with each other.
D. The current and voltage are in phase with each other.
Answer: D
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A motor with polar moment of inertia J develops torque according to the relationship T = a? + b. The motor drives a load defined by the torque–speed relationship TL = c?2 + d. If the four coefficients are all positive constants, determine the equilibrium speeds of the motor-load pair, and whether these speeds are stable.
Find: Equilibrium speeds and their stability. Assumptions: All coefficients of torque-speed curve functions are positive constants.