Answered: rt 1 of 5) A string of 27 identical…

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter7: Electricity

Section: Chapter Questions

Problem 26Q: (Indicates a review question, which means it requires only a basic understanding of the material to...

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Question

Please complete all parts, each part is needed in order to complete the next question. The parts correaltes with eachother.

(part 1 of 5)

A string of 27 identical Christmas tree lights
are connected in series to a 120 V source. The
string dissipates 67 W.
What is the equivalent resistance of the
light string?
Answer in units of Ω

(part 2 of 5)

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

(part 3 of 5)

What power is dissipated in a single light?

Answer in units of W

(part 4 of 5)

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 Rnew of the light
string now?
Answer in units of Ω

(part 5 of 5)

Expert Solution

Step 1

Part1

Voltage applied =120v

27 identical Christmas tree

Power dissipated =67 W

$P = \frac{V^{2}}{R}$

R= $\frac{v^{2}}{p}$

R=214.93 $Ω$

Part 2

All are identical and connected in series

Resistance of single light = $\frac{214.93}{27}$ =7.96 $Ω$

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