Question

35. a) Define 1 ohm of a resistor.
b) A copper wire has diameter 0.5mm and resistivity of 1.6x10 m. What will be the
length of this wire to make its resistance of 100? How much does the resistance change if
the diameter is doubled?​

Answer 1

$\sf\red{Answer:}$

1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows. Ohms is the SI unit of electrical resistance.

Answer 2

Explanation:

a.the ohm is defined as electric resistance between two points of a conductor.

b.diameter =0.5mm=0.5×10power-3=5×10power-4

radius=diameter/2=5×10power-4/2m=2.5×10power-4m

resistance=1.6×10power m

resistance =10

r=p l/A

therefore l=R(A/P)

first we need to find a.

A=pie r square

A=22/7×22.5×(10-4)2

A=22/7×625/100×10-8power

A=1964.28×10-10power m2power

A=1.964×10power -7m2