Wednesday

August 20, 2014

August 20, 2014

Posted by **Andrea** on Wednesday, October 17, 2007 at 4:54pm.

1kw/.065 = x/$105

.065x=105

x=1615.38 kw

is this correct?

How many Joules is that?

I know that 1W =1Joule/second

1kw=1000W

so 1615.38kw /1000 =1.61538 W

then I get 1.61538W

but how would i get this into joules?

- Physics -
**bobpursley**, Wednesday, October 17, 2007 at 5:24pmthe question is really flawed if you typed it correctly. One pays for energy, not power. The price on an electric bill is for kw-hrs (energy), not per kilowatt.

I dont know what to make of the question at all, especially the second part. Kwatts are not equivalent to joules unless you have time enter into the equation.

- Physics -
**drwls**, Wednesday, October 17, 2007 at 5:26pmYou either copied something wrong, omitted an "h" when typing, or your teacher needs a science refresher course. ENERGY is measured in kilowatt-hours (kwh) not kilowatts (kw). POWER is measured in kilowatts. What you pay for is energy, per kwh. Energy is power times time.

Total bill = (no. of kwh) x (cost per kwh, in dollars)

105.00 = N x 0.065

Your answer is numerically correct, but the units are wrong.

To convert kwh to Joules, multiply the number of kwh by this factor:

(3600 Joules/watt-hour)x(1000 watt/kw)

The 3600 comes from the number of seconds in one hour. 1 Joule = 1 Watt-sec

**Related Questions**

Math (dont want the ans just the working) - 4kg of apples costing 80 cents per ...

STATISTICS HELP!!!!!!! - Statistical Abstracts (117th edition) reports sale ...

statistics - Statistical Abstracts (117th edition) reports sale price of ...

College statistics - Statistical Abstracts (117th edition) reports sale price ...

Math - Please help thanks :) I need to know how to figure out this question. ...

maths - A box of 12 table costs 21 cents.The same brand is packaged in bottles ...

Alg I - One type of decorative ribbon regularly costs $3.59 per yard. When the ...

Math - What percent of the selling price in the 14.7 cents per L tax collected ...

statistics - The average electric bill in a residential area is $72 for the ...

MATH, ALGEBRA - cAN SOMEONE JUST SHOW ME HOW TO GET THE EQUATION IN ORDER TO ...