Amotorcyclist is making an electric vest that, when connected to the motorcycle's 12 v battery, will warm her on cold rides. she is using 0.22-mm-diameter copper wire, and she wants a current of 3.9 a in the wire.
what length wire must she use?

Length of the wire, l = 6.78 meters

Explanation:

It is given that,

Voltage of the motorcycle, V = 12 V

Diameter of the copper wire, d = 0.22 mm

Radius, r = 0.11 mm = 0.00011 m

Current in the wire, I = 3.9 A

Resistivity of the copper wire,

The resistance of wire is calculated using Ohm's law as :

R = 3.07 ohms

Resistance of wire in terms of length is given by :

l = 6.78 meters

So, the length of the wire is 6.78 meters. Hence, this is the required solution.

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

c)as speed changes, wavelength and frequency change.

everything changes!