Question

Copper has a resistivity of ?c = 1.72 × 10?? ?·m. An extension cord made of copper is connected to a DC electric motor which requires a current of at least Imin = 6.5 A in order to operate. The cord is connected to a V = 196 V source. 33% Part (a) Input an expression for the maximum ratio of length to cross-sectional area, ?, the cord can have if the motor is to operate. ?max = V/( Imin ?c ) 33% Part (b) What is the ratio numerically in 1/m? ?max = 14.85 * 10? ?max = 1.485E+9 33% Part (c) Experimentally, it is found that the maximum length the cord can be is Lmax = 30 m. What is the wire's minimum diameter, Dmin, in meters? Dmin =

          Copper has a resistivity of ?c = 1.72 × 10?? ?·m. An extension cord made of copper is connected to a DC electric motor which requires a current of at least Imin = 6.5 A in order to operate. The cord is connected to a V = 196 V source.
33% Part (a) Input an expression for the maximum ratio of length to cross-sectional area, ?, the cord can have if the motor is to operate.
?max = V/( Imin ?c )
33% Part (b) What is the ratio numerically in 1/m?
?max = 14.85 * 10?
?max = 1.485E+9
33% Part (c) Experimentally, it is found that the maximum length the cord can be is Lmax = 30 m. What is the wire's minimum diameter, Dmin, in meters?
Dmin =

Copper has a resistivity of ?c = 1.72 × 10?? ?·m. An extension cord made of copper is connected to a DC electric motor which requires a current of at least Imin = 6.5 A in order to operate. The cord is connected to a V = 196 V source.
33% Part (a) Input an expression for the maximum ratio of length to cross-sectional area, ?, the cord can have if the motor is to operate.
?max = V/( Imin ?c )
33% Part (b) What is the ratio numerically in 1/m?
?max = 14.85 * 10?
?max = 1.485E+9
33% Part (c) Experimentally, it is found that the maximum length the cord can be is Lmax = 30 m. What is the wire's minimum diameter, Dmin, in meters?
Dmin =

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