Part 1) A string of 12 identical Christmas tree lights are connected in series t

Question

Part 1)
A string of 12 identical Christmas tree lights
are connected in series to a 128 V source. The
string dissipates 55 W.

What is the equivalent resistance of the
light string?

Part 2)
What is the resistance of a single light?

Part 3)
How much power is dissipated in a single
light?

Answer in units of W.

Part 4)
One of the bulbs quits burning. The string
has a wire that shorts out the bulb filament
when it quits burning, dropping the resistance
of that bulb to zero. All the rest of the bulbs
remain burning.

What is the resistance of the light string
now?

Part 5)
How much power is dissipated by the string
now?

Answer in units of W.
.

Explanation / Answer

1) 55 W/128 V0.43 A==>128 V/0.43 A297.89 total for circuit

2) 297.89 /1224.82 each light

3) 55 W/128 V0.43 A in circuit==>0.43²*24.824.583 W each light

4) 24.82 *11273.07

5) 0.43²*273.0750.42 W

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