MEEN 225 Lecture Notes - Lecture 13: Farad, Inductor, Resistor

• School: Texas A&M University
• Department: Mechanical Engineering
• Course: MEEN 225
• Professor: John Steven Haglund

Document Summary

Ohm"s law in ac circuits: modified to the form: v = i z where. Z - the impedance 3 main components: resistor, inductor, capacitor. Pure resistive load: the impedance, z consists only of a resistor i. e. z = r. Pure resistive circuit: phasor diagram, current is in phase with voltage , = v - i = 0 therefore, v = i , with v taken as reference point, the phasor diagram is shown below , power factor, p. f. = cos : power factor is 1. 0 or unity since = 0 . Inductive load: the impedance, z consists of a resistor in series with an inductor i. e. z = r + j xl. Inductive circuit: phasor diagram, current lags voltage , when a voltage is applied to an inductor, it resists the change in current. Current builds up more slowly than the voltage, lagging it in time and phase: = v - i > 0 , power factor, p. f.