Understanding Electrical Resistance

The video tutorial explains the concept of electrical resistance, which is the opposition to the flow of electrons in a material. It discusses how resistance is affected by the length and cross-sectional area of the material. The tutorial compares the resistivity of various conducting materials, highlighting that silver has the lowest resistivity, followed by copper. The formula for calculating resistance is provided, emphasizing the role of resistivity, length, and cross-sectional area.

What is the unit of measurement for electrical resistance?

• Ohm

• Ampere

• Volt

• Watt

What is the primary cause of electric current in a material?

• Ions

• Neutrons

• Protons

• Free electrons

How does the length of a material affect its resistance?

• Resistance is inversely proportional to length

• Length has no effect on resistance

• Resistance is directly proportional to length

• Resistance is proportional to the square of the length

Which of the following materials has low resistance?

• Iron

• Copper

• Tungsten

• Nichrome

What is the term used for the specific resistance of a material?

• Inductance

• Capacitance

• Resistivity

• Conductivity

Which material has the lowest resistivity?

• Copper

• Gold

• Silver

• Aluminum

What is the resistivity of silver?

• 0.022 x 10^-6 ohm m

• 0.020 x 10^-6 ohm m

• 0.016 x 10^-6 ohm m

• 0.018 x 10^-6 ohm m

Which material is more conductive than copper?

• Aluminum

• Gold

• Iron

• Silver

What is the resistivity of copper compared to silver?

• Equal to silver

• Lower than silver

• Higher than silver

• Twice that of silver