Author Topic: How do i figure out defrost heaters in parallel  (Read 1761 times)

Offline R.J.

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How do i figure out defrost heaters in parallel
« on: December 09, 2011, 10:31:19 AM »
this is one of the questions on the test.If you have 3 defrost  heaters and each one is 15 ohm's,the incoming voltage is 120V and then it asks what would be the watts.   take 120 volt and divide 15ohms and get 8 amps then that means each one has 8 amps. i think it said what would each defrost heater would be. the watts then I would divide 120volts divide by 8 would be 15 watts.I think I'm right :-\

Offline JWWebster

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Re: How do i figure out defrost heaters in parallel
« Reply #1 on: December 09, 2011, 11:40:41 AM »
Don't want to throw a monkey wrench in there because my math is kinda fuzzy, but what if all three heaters were differing lengths? LOL
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Offline tgoods

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Re: How do i figure out defrost heaters in parallel
« Reply #2 on: December 10, 2011, 10:19:15 AM »
Watts = Volts x amps.  In this case, you solved correctly for amps, 8.  Your wattage is then, 120 x 8 = 960.  Since the heaters are in parallel, it would be 3 x 960 = 2880.  The total wattage of the heaters is 2880.

Offline new tech

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Re: How do i figure out defrost heaters in parallel
« Reply #3 on: December 10, 2011, 11:53:22 AM »
Why would you need to know the wattage of the defrost heater?

Offline jumptrout51

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Re: How do i figure out defrost heaters in parallel
« Reply #4 on: December 10, 2011, 03:58:37 PM »
Why would you need to know the wattage of the defrost heater?
So that you would know if it is operating correctly or over or under specs.
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