57. mmh A coffee cup heater and a lamp are connected in parallel to the same 120-V outlet. Together, they use a total of 111 W of power. The resistance of the heater is 4.0 x 102 Ω. Find the resistance of the lamp.

We know the total power is the sum of the power of each

And since we know the resistance of the heater we can find power of the heater alone

So power of lamp is

Now we can find resistance of lamp

Alternatively Could use Total Power can be expressed

And R_total can be found

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