- #1

graphicer89

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## Homework Statement

A) How much power does a light bulb connected to a 120 V outlet use if it draws .5 A of current? Show your calculations

B) One kilowatt hour is a measure of energy which is equal to 3,600,000 J. How many hours would you have to leave on the light bulb from part A (60 W) in order to expend one kilowatt hour of energy (Remember that 1 W= 1 J/s)

C) If one kilowatt hour costs $.10 how long would you have to leave the light bulb from Part A) on in order to spend $1.00 on electricity? Show your calculations

## Homework Equations

A) Current x voltage = energy

B) ?

## The Attempt at a Solution

A) 120 V x .5 A = 60 W

B) I know that 60 w = 60 joules...so would it be 3,600,000 joules / 60 joules = 60,000 hours? I honest do not think that makes sense ..please help me out...

C) If i got the right answer from B...then 60,000 hours x .10 = 6,000 hours?...please help me out i am so close to finishing physics...and i just need help with this...