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 100pcs 10K ohm Trimmer Trim Pot Potentiometer 3362  US $34.99
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 100pcs 2K ohm Trimmer Trim Pot Resistor 3296 US $34.99
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can anyone help me with this physics problem please?! (reguarding resistance)?
An extension cord is used with an electric weed trimmer that has a resistance of 21.0 . The extension cord is made of copper wire that has a cross-sectional area of 1.60 10-6 m2. The combined length of the two wires in the extension cord is 86 m.
(a) Determine the resistance of the extension cord.
_______ohms
(b) The extension cord is plugged into a 60-V socket. What voltage is applied to the trimmer itself?
_______V
The resistance of the cord is given by:
R = p*A/L where p = resistivity, A = cross sectional area or the wire and L = length of wire in this case 86 m.
Look up the value of p for copper in your textbook. Plug in the values and you get R
In part b, treat the cord as a resistor in series with the trimmer. Then by ohms law:
V = I*(R + Rtrim) where Rtrim = 21 Ohms
Vtrim = I Rtrim = V*Rtrim/(R + Rtrim) V = 60 V and R is from part a.
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100pcs 10K ohm Trimmer Trim Pot Potentiometer 3362 US $34.99
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