# How Do I Calculate Heat Generated in Wires ?

Discussion in 'General Electronics Chat' started by t00t, May 16, 2015.

1. ### t00t Thread Starter Member

Jan 22, 2015
63
1
Hi have been searching the internet for a while but haven't come up with an answer.

Read something about how watts is connected to heat in wires . Or how it maybe due to electrical radiation .

But still i cannot find a standard equation to determine the heat generated in wires.

Thanks.
t00t

2. ### ian field AAC Fanatic!

Oct 27, 2012
5,563
985
Try the electrical regs for the building industry.

3. ### Kermit2 AAC Fanatic!

Feb 5, 2010
4,165
1,121
Current squared times resistance will give the loss due to a current flowing in a resistance(in watts)
This loss is almost 100% evidenced as heat in the wire. To calculate the temperature rise that occurs from this is much more difficult and involves
the time and amount of heat which the insulation can transfer to the outside, it also depends on the temperature outside of the wire and whether
the wire is inside of conduit or layered in a coil, etc etc etc.

4. ### ian field AAC Fanatic!

Oct 27, 2012
5,563
985
Bundles of wires can do pretty strange things.

Ever tried running a washing machine on a heavy duty extension lead that's still coiled on the drum?!

5. ### BR-549 Distinguished Member

Sep 22, 2013
3,088
755
A watt is just an unit of power. This heating is due to resistance.
You can find the resistance in wire tables.
Then you have to know how much current is going thru the wire.
Then you can figure how much heat loss in watts, you have.

How you ever worked with electricity before?

If you haven't, then my comment means nothing to you.