Magtanong at makakuha ng maaasahang mga sagot sa IDNStudy.com. Ang aming platform ay nagbibigay ng mga maaasahang sagot upang matulungan kang gumawa ng matalinong desisyon nang mabilis at madali.

Copper wiring in a house usually has a diameter of approximately 1.5 mm. What length of copper wire would have a resistance of 1.0 ​

Sagot :

Given,

diameter of copper wire = 0.5mm = 5 × 10-⁴m

restivity = 1.6 × 10 ^-8 ohm.m

resinstance = 10 ohm

length =?

we know,

R = dL/A

where A , d , L and A are resistance , restivity , length and cross section area.

10 = 1.6 × 10^-8 × L/(πr²)

L = 10 × 3.14 × (2.5 × 10^-4)² × 10 ^-8/1.6

L = 10 × 3.14 × 6.25/1.6

L = 122.656 m