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HW6 - Escuti/Masnari 2007 ECE200 Fall 2007 Homework 6...

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Escuti/Masnari 2007 ECE200 – Fall 2007 – Homework 6 Electric Power Page 1 of 3 Problem 1: Consider a standard light bulb rated at 60W assuming 120Vrms/60Hz. Due to excessive electricity usage in a neighborhood, the RMS value of the AC voltage delivered to the houses drops from 120 to 115 V. What is the power consumed by the light bulb under this circumstance? (Note that the answer is NOT 60W, and that you may assume that the internal resistance of the light bulb is constant at all voltages). Problem 2: a) Sketch the current waveform, i ( t ) flowing through the resistor. b) Find the average or DC value of the current flowing through the resistor. c) Find the instantaneous power, p ( t ) dissipated on the resistor. d) Find the real power, P dissipated on the resistor. Problem 3: Consider the circuit shown below. a. Find the real power dissipated on the 4 k Ω resistor. b. Calculate the RMS value of the current, i X ( t ).
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Escuti/Masnari 2007 ECE200 – Fall 2007 – Homework 6 Electric Power Page 2 of 3 Problem 4:
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