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Subject Topic: how many amps for a 1.5kw heater? (Topic Closed Topic Closed)
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16/3/2012 at 9:45am
 Location: West Midlands
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I would have thought the OP does not need a result quoted to several decimal places, confirmation of between 6 and 7 amps is all that is required.

-------------
Tony C


16/3/2012 at 11:09am
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Quote: Originally posted by morgz84 on 16/3/2012
Nonsense. Current does not get higher as the voltage increases, it decreases!!    Why do people insist on spreading misinformation?    

It's not nonsense, it's Ohm's Law.

Electrical current is a flow of electrons, analagous to a flow of water in a stream. Voltage is analagous to the steepness of the hill down which the stream is flowing.

A steeper hill produces a faster flow, just as a higher voltage produces more current.

You are assuming that P = VI means that current goes up as voltage goes down. But the power is not constant.

Take a 60W bulb and connect it to a torch battery with a low voltage. If your analysis is correct, the current would be huge and the bulb would be really bright because the power is a constant 60W.

But your analysis is not correct: The 60W bulb will give barely a glimmer because it's designed to produce 60W at 230V. At the tiny voltage of 1.5V, the current will be tiny and the power output will be tiny.

If you still believe this is nonsense, go and try it and tell us if you get a bright light.

-------------
Richard


16/3/2012 at 11:22am
 Location: Northern Ireland
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All we have proved, is that it is not a simple matter!

In an effort to resolve the original query ... can I point you at the site below ... it contains a simple tool for calculating, as well as outlining the various theories and parameters discussed.

Don't try to understand it ... just use it ... and you'll get useful answers to any mix of two numbers you care to enter. Note the second calculator at the very end. Don't be concerned about the 'acoustic' bent of the site ... electrical laws still apply.

http://www.sengpielaudio.com/calculator-ohm.htm


16/3/2012 at 2:20pm
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Quote: Originally posted by morgz84 on 16/3/2012


Nonsense. Current does not get higher as the voltage increases, it decreases!!    Why do people insist on spreading misinformation?    
Quote: Originally posted by morgz84 on 16/3/2012 


   Http://www.tlc-direct.co.uk/Book/1.1.htm

Who is spreading misinformation? If you refer to the above link you will see that the experts agree,increased voltage leads to an increase in Amps

Having been accused of being a devious politician and an Idiot it's refreshing to see that there is someone else on this forum that understands OHM's law.Thank you Sanhozay.

Saxo1
  



16/3/2012 at 2:45pm
 Location: Northern Ireland
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http://www.ebtx.com/mech/ampvolt.htm


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16/3/2012 at 3:11pm
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I think if the OP has found this from the second posting he has his answer

        WATTS TO AMPS CONVERSION

  60 Watts      =     0.26 Amp
 100 Watts     =     0.43 Amp
 200 Watts     =     0.87 Amp
 300 Watts     =     1.30 Amp
 400 Watts     =     1.74 Amp
 500 Watts     =     2.17 Amp
 600 Watts     =     2.61 Amp
 700 Watts     =     3.04 Amp
 800 Watts     =     3.48 Amp
 900 Watts     =     3.91 Amp
1000 Watts    =     4.35 Amp
1100 Watts    =     4.78 Amp
1200 Watts    =     5.22 Amp
1300 Watts    =     5.65 Amp
1400 Watts    =     6.09 Amp
1500 Watts    =     6.52 Amp
1600 Watts    =     6.96 Amp
1700 Watts    =     7.39 Amp
1800 Watts    =     7.83 Amp
1900 Watts    =     8.26 Amp
2000 Watts    =     8.70 Amp
2100 Watts    =     9.13 Amp
2200 Watts    =     9.57 Amp
2300 Watts    =    10.00 Amp
2400 Watts    =    10.43 Amp
2500 Watts    =    10.87 Amp
2600 Watts    =    11.30 Amp
2700 Watts    =    11.74 Amp
2800 Watts    =    12.17Amp
2900 Watts    =    12.61 Amp
3000 Watts    =    13.04 Amp
3100 Watts    =    13.48 Amp
3200 Watts    =    13.91 Amp
3300 Watts    =    14.35 Amp
3400 Watts    =    14.78 Amp
3500 Watts    =    15.22Amp



16/3/2012 at 3:18pm
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Quote: Originally posted by Kelper on 16/3/2012


All we have proved, is that it is not a simple matter!

In an effort to resolve the original query ... can I point you at the site below ... it contains a simple tool for calculating, as well as outlining the various theories and parameters discussed.

Don't try to understand it ... just use it ... and you'll get useful answers to any mix of two numbers you care to enter. Note the second calculator at the very end. Don't be concerned about the 'acoustic' bent of the site ... electrical laws still apply.

http://www.sengpielaudio.com/calculator-ohm.htm

Yeeeahhhh!! When I input 1500w and 230v it calculated 6.521739130434782 amps

...er...oh....hang on...that's 0.000000000000001 amps different to my first calculation




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