Ohm Trimmer
Ohm Trimmer
i really dont get this physics problem,(voltage &resistance)?
An extension cord is used with an electric weed trimmer that has a resistance of 21 ohms . The extension cord is made of copper wire that has a cross-sectional area of 1.60×10^-6 m^2. 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?
______voltage
(rho) for copper is 1.72 x 10^-8 ohm-meter
Rextention cord=(rho)L/A=
=(1.72×10^-8) (86/1.6×10^-6)=0.9245 ohms
Vtrimmer=(60×21)/21.9245=57.47volts
God bless you.
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