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A copper wire is used as a résistor in an électri circuit. .explain how each of followin action affect size of curen in circuit

 
A copper wire is used as a résistor in an électri circuit. .explain how each of followin action affect size of curen in circuit
 

Grade:10

1 Answers

ats
103 Points
3 years ago
The resistance of a copper wire is given by the formula,
  R = p x l / a         where p is the resistivity of copper, l is the length of the copper wire and a is its cross-sectional area.
 
So from this expression you can see that increasing the length of the wire by n times will increase its resistance by n times and hence decrease the current by n times. Whereas, increasing the cross-sectional area of the wire by n times will decrease its resistance by n times and hence increase the current by n times.
 
Hope it helps!

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