Homework Help: PHY (NEED ANSWER SOON PLS)

Posted by Anonymous on Tuesday, May 31, 2011 at 3:36pm.

A 2400 watt appliance operating at 10 amps has most nearly_____ ohms resistance.

A) 24
B) 0.5
C) 5
D) 240
E) need more info

I tried to find a formula to use, but i dont know which one to use. Thank you.

PHY (NEED ANSWER SOON PLS) - MathMate, Tuesday, May 31, 2011 at 4:01pm
Power = Vi = V²/r = i²r
In the given problem, you have been given the current i=10 amps, Power = 2400 watts.
The resistance can be calculated from one of the above formulas.
PHY (NEED ANSWER SOON PLS) - Anonymous, Tuesday, May 31, 2011 at 4:43pm
so can i use P=i(^2)r
r=P/i(^2)=24

so the answer is A, correct?
PHY (NEED ANSWER SOON PLS) - MathMate, Tuesday, May 31, 2011 at 5:05pm
Right!

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