Right i really dont understand this but thought someone else on here might! Well i have this worksheet. This is one of the questions see if you get it:
1. Work out the power of these electric fires, to the nearest watt, if they produce 1000 kj in these amounts of time
a) 200 seconds
b) 8 minutes
c)10 minutes
Do you understand them, there are loads more by the way im not tryna get h/w awnsers of people! lol
If you do get them could you please tell me how you worked them out in a easy way to understand as i have 2 worksheets to complete on this lol
Thank You
(10 points will be rewarded)
P.S- I also have these notes
Joules: 1KJ = 1000J
Find P if Wd = 60 J and t = 10
2007-02-01 07:36:33 · 2 answers · asked by § gαввαηα § 5 in Science & Mathematics ➔ Physics
The energy is the power times the time. In these examples, the energy is given, the times are supplied, and the power is wanted, so a simple division will do the trick The energy is 1,000,000 joules, so if the time is 200 seconds, the power is 5,000 watts. The other examples are done similarly, converting the times to seconds.
2007-02-01 07:44:28 · answer #1 · answered by Anonymous · 1⤊ 0⤋
One watt is 1 joule per second. That's one of the nice things about the metric system: a lot of the formulas don't have funny numbers in them.
And of course you know that 1 minute is 60 seconds.
2007-02-01 07:46:35 · answer #2 · answered by morningfoxnorth 6 · 0⤊ 1⤋