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Quick Hot Water Heater question
#177490
05/04/08 05:36 PM

Joined: Mar 2004
Posts: 193
OP
Member

One of my buddies from school was doing some work at his uncle's house and called me with a question.
Apparently someone had wired the Hot water Heater through a nearby receptacle. The water heater is 208/240 and the receptacle is 120.
My understanding of it is the element will still work, just at half capacity. Is this incorrect?
He is currently correcting it. I just wanted to hear some opinions on the matter.
"If common sense was common, everyone would have it"not sure, someone here



Re: Quick Hot Water Heater question
[Re: GA76JW]
#177491
05/04/08 05:49 PM

Joined: Mar 2004
Posts: 947
Member




Re: Quick Hot Water Heater question
[Re: twh]
#177493
05/04/08 07:04 PM

Joined: Mar 2004
Posts: 193
OP
Member

Could you throw some theory at me to show how that happens?
"If common sense was common, everyone would have it"not sure, someone here



Re: Quick Hot Water Heater question
[Re: GA76JW]
#177497
05/04/08 07:18 PM

Joined: Jul 2004
Posts: 9,540
Member

Resistance is fixed. Amps is volts divided by resistance. Watts is amps times volts. Notice volts figures in both equations and one feeds the next so volts gets used twice. Twice the volts is twice the amps and that is again multiplied by volts. The power formula sums it up with watts equals the square of the volts times the resistance (P=I2R)
Greg Fretwell



Re: Quick Hot Water Heater question
[Re: GA76JW]
#177498
05/04/08 07:20 PM

Joined: Mar 2004
Posts: 947
Member

At 240 volts and a 24 ohm element: E = I x R 240 = I x 24 10 = I
W = E X I W = 240 X 10 W = 2400
At 120 Volts and a 24 ohm element: E = I x R 120 = I x 24 5 = I
W = E x I W = 120 x 5 W = 600
Or .5 of the voltage x .5 of the current = .25 of the watts.



Re: Quick Hot Water Heater question
[Re: twh]
#177521
05/05/08 03:28 PM

Joined: Mar 2004
Posts: 193
OP
Member

Thanks for clearing that up guys.
It makes more sense now that you threw the numbers up.
"If common sense was common, everyone would have it"not sure, someone here




