Question

1. Which type of wire would be a better conductor of an electrical current?

a. Short, fat, cold wire

b. Long, thin, warm wire


2. As the collisions between electrons and protons increase, the electrical current will

a. increase

b. decrease


3. Which change will cause an increase in the resistance of conductivity?

a. Changing from a long wire to a shorter wire.

b. Sunlight heating up a wire.

c. Exchanging a thin wire for a much thicker wire.


Thanks for the help! <3

Answer 1

1. a

2. b

3. b

Step-by-step explanation:

1.

Resistance is the property of a conductor to offer resistance to the flow of current. The lower the resistance better is the conductivity of wire.

We know that the resistance of a wire depends on several factor which are inter-connected by an equation as:

`R=\rho.(l)/(a)`

where:

R = resistance of the wire

`l =` length of the wire

`a=` cross sectional area of the wire

from the above relation we observe that

`R\propto l`

`R\propto (1)/(a)`

• Also when the temperature of the wire is significantly high then the lattice vibration cause obstruction in the path of the flowing charges and reduce the current flow.

2.

As the collision between the electrons and protons increases the speed of the flow of charges will decrease because the opposite charges attract each other and as we know that electrical current is the rate of flow of charge.

3.

Heating up of wire due to sunlight will cause lattice vibration in the conductor and will obstruct the movement of the charges which build up electric current, hence increasing the resistance of conductivity.