Power in Circuits Video Lessons

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Problem: Two light bulbs have resistances of 400 Ω and 800 ΩPart AThe two light bulbs are connected in series across a 120- V line. Find the current through each bulb.Enter your answers numerically separated by a comma.I400, I800 =______APart BFind the power dissipated in each bulb.P400, P800 =________WPart CFind the total power dissipated in both bulbs.P =______W

FREE Expert Solution

Part A

Current:

i=VReq

For resistors in series:

Req=R1+R2=400+800

Req = 1200Ω

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Problem Details

Two light bulbs have resistances of 400 Ω and 800 Ω

Part A

The two light bulbs are connected in series across a 120- V line. Find the current through each bulb.
Enter your answers numerically separated by a comma.
I400, I800 =______A

Part B
Find the power dissipated in each bulb.
P400, P800 =________W


Part C
Find the total power dissipated in both bulbs.
P =______W

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