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nikklg [1K]
3 years ago
7

Using aluminum wire(2.82x10^-8 ohm) of diameter 1.60mm, you want to wind a resistor that will dissipate 25.0 W when 25.0 V is ap

plied across it . What length( in m) of wire is needed?
Physics
1 answer:
kiruha [24]3 years ago
4 0

Answer:

4565 meters

Explanation:

W = V²/R

25 = (25)²/R

R = 25 ohm

R = (pl)/A

R =  \frac{pl}{2\pi( \frac{d}{2} )}

25 =  \frac{( 2.82\times  {10}^{ - 8}  \times l)}{2\pi (\frac{1.60 \times  {10}^{ - 6} }{2}) }

l = 4565 meters approximately

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