Bryan Orr( Founder / Podcaster / Dad of 10 )

Bryan Orr is a lifelong learner, proud technician and advocate for the HVAC/R Trade

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I though P=EI and E=IR. To #5.

Watts(P) = Amps(I) X Volts (E)

Question number 2: I = P / U gives 5000W / 23V = 217 A

No?

746 watts per hp. Should have read the question more closely and realized it was asking for Btu’s.

For Question #2 can you please explain how you got to that answer!? 1 Kw = 1000W, so using P= E x I, I just did 5000W (5Kw) / 23 = 217 .. I’m super confused!

Instead of doing P=V x A. We convert 5 kW to 5000 watts. Divide 5000W / 230V = nominally 22 amps (21.73). We can now use ohms law to find the actual resistance of the 5kW strip with this information.

R= V/A: R= 230V/21.73A. R=10.58

now if we do 23V/10.58 we get 2.17 amps.

So the answer is really found in finding the resistance in the 5kW strip.