Resistivity

The video tutorial explains the concepts of open and closed circuits using a battery and light bulb. It tests various materials to determine their conductivity, distinguishing between conductors and insulators. The tutorial delves into resistivity and resistance, explaining their relationship and the equation that connects them. It also covers semiconductors and how temperature affects resistivity, highlighting the differences between conductors and semiconductors in terms of temperature dependence.

What happens to the light bulb when the red and white wires are disconnected?

• The light bulb explodes.

• The light bulb flickers.

• The light bulb stops glowing.

• The light bulb glows brighter.

Which material was found to be an insulator in the circuit test?

• Aluminum foil

• Plastic spoon

• Banjo string

• Gold wedding ring

Which of the following materials is a conductor?

• Plastic

• Stainless steel

• Rubber

• Glass

Which of the following statements is true about insulators?

• They have loosely bound electrons.

• They are good conductors of electricity.

• They allow easy flow of current.

• They have tightly bound electrons.

What is the main difference between resistivity and resistance?

• Resistivity is measured in ohms, while resistance is measured in ohm meters.

• Resistivity is a property of a material, while resistance is a property of an object.

• Resistivity depends on the length of the object, while resistance does not.

• Resistivity is only applicable to insulators, while resistance is for conductors.

What is the relationship between resistance and the cross-sectional area of a resistor?

• Resistance is directly proportional to the cross-sectional area.

• Resistance is inversely proportional to the cross-sectional area.

• Resistance is independent of the cross-sectional area.

• Resistance is exponentially related to the cross-sectional area.

What is the unit of resistivity?

• Ohms

• Meters per ohm

• Ohm meters

• Meters

Which materials are classified as semiconductors?

• Aluminum and copper

• Silicon and germanium

• Plastic and rubber

• Gold and silver

How does temperature affect the resistivity of conductors?

• Resistivity fluctuates randomly with temperature changes.

• Resistivity increases as temperature increases.

• Resistivity remains constant regardless of temperature.

• Resistivity decreases as temperature increases.

What happens to the resistivity of semiconductors as temperature increases?

• It increases.

• It decreases.

• It remains constant.

• It becomes zero.