watts to amps?

Submitted: Thursday, Feb 05, 2004 at 19:24
ThreadID: 10301 Views:1731 Replies:2 FollowUps:10
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Hi all, looking at a fridge & it uses approx. 70watts, how many amps is this?

Thanks in anticipation,
Rowler (dave)
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Reply By: whyworry - Thursday, Feb 05, 2004 at 19:29

Thursday, Feb 05, 2004 at 19:29
e=ir answer 12v 5.8amps. 24v about 3amps
AnswerID: 45588

Follow Up By: Rowler - Thursday, Feb 05, 2004 at 19:33

Thursday, Feb 05, 2004 at 19:33
Thanks for that, I was off searching the web for the answer.... should have done it before.... well it gave you a chance to show your knowledge on the subject.
Got the same answer too!

Cheers Rowler (dave)
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Follow Up By: Member - Ross - Thursday, Feb 05, 2004 at 19:41

Thursday, Feb 05, 2004 at 19:41
Almost correct .. but no quite.
E=IR

i.e Electromotive force (E) = Amps (I) x Resistance (R)

Note E can be taken to mean V

Absolutely correct formula but without a value for R you cannot arrive at the answer.

Try P=VI

i.e. P (Power (Watts)) = Voltage (V) x Amps (I)

Hence 70 = 12 x I or I = 70/12 = 5.8333

Correct answer but stuffed if I know how ya got it.

................. ;-D

CheersFidei defensor

Rosco
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Follow Up By: whyworry - Thursday, Feb 05, 2004 at 19:48

Thursday, Feb 05, 2004 at 19:48
sorry been pulling the plow for to long not using grey matter
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Follow Up By: Rowler - Thursday, Feb 05, 2004 at 20:01

Thursday, Feb 05, 2004 at 20:01
I looked up some web page & it said.... Watts/Volts=Amps
Same answer too :-)

Thanks Rowler (dave)
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FollowupID: 307668

Follow Up By: Member - Ross - Thursday, Feb 05, 2004 at 20:02

Thursday, Feb 05, 2004 at 20:02
Ya get that ... knock off and have a beer.

CheersFidei defensor

Rosco
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Follow Up By: V8troopie - Friday, Feb 06, 2004 at 00:52

Friday, Feb 06, 2004 at 00:52
If you want to be *really* pedantic you got to allow for that a 12V battery is pretty flat if you measure 12V on the terminals.
Try doing the calculation again, using 12.6V as per fully charged battery.
Even more pedantic, if you run the fridge while the engine is charging the battery, use 14 - 14.5V for your calculation.
Klaus
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FollowupID: 307710

Reply By: Brian - Thursday, Feb 05, 2004 at 19:56

Thursday, Feb 05, 2004 at 19:56
Rosco,

I once worked with a "Rosco" here in the big Sid er nee. He moved to Qld, and we lost contact. You don't happen to live in Brisie do you?

Thanks
Brian
AnswerID: 45591

Follow Up By: Member - Ross - Thursday, Feb 05, 2004 at 20:00

Thursday, Feb 05, 2004 at 20:00
Brian

Certainly do .... born and bred ... should I say dragged up.. in these parts.

Never worked in Siderley. Great place to visit ... wouldn't want to bloody live there tho'

..............;-))))))))))

Cheers
Fidei defensor

Rosco
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FollowupID: 307667

Follow Up By: Brian - Thursday, Feb 05, 2004 at 20:10

Thursday, Feb 05, 2004 at 20:10
Thanks for the reply Rosco. My mate Ross was (is, me as well) a sparky, and you sound like one.

Catch you 'round
Brian
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FollowupID: 307670

Follow Up By: Member - Ross - Thursday, Feb 05, 2004 at 20:16

Thursday, Feb 05, 2004 at 20:16
Worse .... ginger beer.........................Fidei defensor

Rosco
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FollowupID: 307671

Follow Up By: Brian - Thursday, Feb 05, 2004 at 20:48

Thursday, Feb 05, 2004 at 20:48
Can't help bad luck.

Brian
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