So, 36 ohms?
Craig McCluskey wrote:
On Sat, 9 Jan 2010 14:58:12 -0800 (PST) Dimitri Seretakis
<dsereta...@yahoo.com> wrote:
What should the resistance reading be?
It's a 400 W heater that runs on 120 VAC.
Since Power = Current x Voltage (P = I E),
P 400
I = --- = ----- = 3.33 A
E 120
>From Ohm's Law,
E 120
E = I R => R = --- = ------ = 36 ohms
I 3.33
You can also combine the formula for power and Ohm's Law algebraically
before substituting in numbers. You end up with,
2
E 120 * 120
R = ----- = ----------- = 36 ohms
P 400
Craig
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