Current and Resistance

The ability of a metal to allow heat or electricity to pass through it.

• conductivity
• insulator
• mass
• density

Resistivity, the inverse of conductivity, is only dependent on which of the following? (choose one)

• shape of the wire

• length of the wire

• cross-sectional area of the wire

• type of metal

The resistance of a material

• depends on its resistivity and the geometric properties of the material.

• does not depend on its resistivity or the geometric properties of the material.

• depends on its resistivity but not the geometric properties of the material.

• does not depend on its resistivity but on the geometric properties of the material.

Wire A has twice the cross sectional area of wire B. The resistance of wire B is __________________ wire A.

• 1/4 as much as

• 1/2 as much as

• the same as

• twice as much as

Which of the following aluminum wires would have the greatest resistance?

• 3 cm in length and 2 cm in diameter

• 6 cm in length and 2 cm in diameter

• 9 cm in length and 2 cm in diameter

• 12 cm in length and 2 cm in diameter

Which of the following are a result of the resistance to current?

• Electric potential energy to be converted to other energy forms.

• A reduction in current.

• The wire to heat up.

• All of the above.

Which of the following statements are true?

• Voltage will not exist without any current

• Batteries are the source charges in a current

• Currents will not exist without any voltage

• Current travels through wires near light speeds

How will increasing the amount of resistance in a circuit affect the current if the voltage remains constant?

• It will increase

• It will not change

• It will decrease

• It will cease

If a light bulb burns out in a series circuit, the total current

• remains unchanged

• becomes zero

• is increased a little

• is decreased a little

When the charges move through a circuit in one direction this type of current is called…

• Alternating Current

• Breaking Current

• Circulating Current

• Direct Current