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Escuti/Masnari 2007
ECE200 – Fall 2007 – Homework 6
Electric Power
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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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ECE200 – Fall 2007 – Homework 6
Electric Power
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This homework help was uploaded on 03/20/2008 for the course ECE 200 taught by Professor Escuti during the Fall '07 term at N.C. State.
 Fall '07
 Escuti
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