# coffee cup (mug) warmer

• posted on May 9, 2008, 10:46 am
Been unable to locate 25 watt one. All the new ones which have little more than half that wattage don't keep coffee hot enough for me. My old Dazey 25 watt one did a great job, but it died. What controls wattage? Would like to convert one of the new lower wattage ones to 25 watts. What would I have to replace to do that?
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• posted on May 9, 2008, 11:04 am
on 5/9/2008 6:46 AM Frank Thompson said the following:

The cup.
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Bill
In Hamptonburgh, NY
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• posted on May 9, 2008, 1:00 pm
Frank,
Most likely the heating element determines the wattage. I'm guessing that you have a mini hot plate so it would be difficult to upgrade the wattage. I looked around on the net and most of these ot plates don't have a wattage on their ads. You could try a bigger hot plate such as those designed for a carafe. And of course there's the microwave oven or sterno.
Dave M.
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• posted on May 9, 2008, 1:03 pm

This one rated at 24 watts.
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• posted on May 9, 2008, 1:36 pm
Running it on 240V would double the wattage (assuming you are now on 120V) but it also would likely burn out the element.

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Joseph Meehan

Dia \'s Muire duit
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• posted on May 9, 2008, 1:46 pm
Joseph Meehan wrote:

Doubling the voltage would increase the power by a factor of four (P=(E)squared/R) because it is a square law function.
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• posted on May 9, 2008, 11:36 pm

The base equation is P=IE
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• posted on May 10, 2008, 1:51 am
wrote:

Never realised that coffe was such a dangerous substance! But by the way; DOUBLING THE VOLTAGE! Doubling the voltage (of a resistive device such as a heater) will also double the current. Twice the voltage and twice the current will result in FOUR Times the wattage!!!! Absolutely basic Ohm's Law; ....... Volts times Amps = Watts
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• posted on May 10, 2008, 11:54 am

You are confusing two equation here: P=IE (power or Watts) and E=IR (Ohm's Law, volts=current x resistance)