The radius of 22-gauge Nichrome wire is 0.32 mm with resistivity rho = 1x10-6 Ω-m. (A) Calculate the resistance for 6 m length of this wire. (B) If a potential difference of 12 V is maintained across the Nichrome wire, what is the current in the wire?

(A) Resistance of wire is 18.65 Ω.

(B) Current in the wire is 0.64 A.

Explanation:

Given :

Radius of wire, r = 0.32 mm = 0.32 x 10⁻³ m

Resistivity of wire, ρ = 1 x 10⁻⁶ Ω-m

(A) Length of wire, l = 6 m

Area of the wire, A = πr²

Resistance of the wire, R = (ρl)/A = (ρl)/(πr²)

Substitute the suitable values in the above equation.

R = 18.65 Ω

(B) Potential difference, V = 12 volts

Using Ohm's law, V = i x R

Here i is current.

Substitute the values in the above equation.

i = 0.64 A

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.