- #1

- 1

- 0

## Homework Statement

A string of 19 identical Christmas tree lights

are connected in series to a 120 V source. The

string dissipates 60 W.

What is the equivalent resistance of the

light string? Answer in units of ohms.

What is the resistance of a single light? An-

swer in units of .

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 Rnew of the light

string now? Answer in units of ohms.

Find the power Pnew dissipated by the string

now. Answer in units of W.

## Homework Equations

P=IV

I=V/R

P=(V/R)V

R=V2/R

## The Attempt at a Solution

I'm not sure how to start, since the dissipation of power is in watts. thanks for any hints or help you can give !