College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question

A string of 27 identical Christmas tree lights
are connected in series to a 120 V source. The
string dissipates 75 W.
What is the equivalent resistance of the
light string?
Answer in units of Ω

What is the resistance of a single light?
Answer in units of Ω.

What power is dissipated in a single light?
Answer in units of W

One of the bulbs burns out. The lamp has a
wire that shorts out the bulb filament when it
burns out, dropping the resistance of the bulb
to zero.
What is the resistance R(new) of the light
string now?
Answer in units of Ω.

Find the power P(new) dissipated by the string
now.
Answer in units of W.

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