#1
What is the primary function of an electrical conductor?
Facilitate the flow of electricity
ExplanationConducts electricity
#2
Which of the following materials is a good conductor of electricity?
Copper
ExplanationCopper conducts electricity well
#3
What is the purpose of an insulator in an electrical system?
To block the flow of electricity
ExplanationInsulators prevent electrical flow
#4
What is the primary purpose of a lightning rod in electrical systems?
To protect against lightning strikes
ExplanationProtects against lightning
#5
What is the purpose of strain relief in electrical conductors?
Protects against mechanical stress
ExplanationStrain relief guards against mechanical stress
#6
What is the primary function of a fuse in an electrical circuit?
Protect against overcurrent
ExplanationFuses guard against overcurrent
#7
What is the SI unit of electrical resistance?
Ohm
ExplanationResistance is measured in ohms
#8
In electrical conductors, what is the relationship between temperature and resistance?
As temperature increases, resistance increases
ExplanationResistance rises with temperature
#9
Which property of a material determines its ability to conduct electricity?
Conductivity
ExplanationConductivity defines electrical conduction
#10
Which of the following metals is commonly used as a heating element due to its high resistance?
Nichrome
ExplanationNichrome's high resistance heats it effectively
#11
What is the primary advantage of using aluminum as a conductor in power transmission lines?
Lower cost and lighter weight
ExplanationAluminum is cheaper and lighter for transmission
#12
What is the effect of cross-sectional area on the resistance of an electrical conductor?
Increasing cross-sectional area decreases resistance
ExplanationLarger cross-sections reduce resistance
#13
What is the skin effect in electrical conductors?
Concentration of current near the surface
ExplanationCurrent concentrates near surface
#14
What is the function of a superconductor in electrical applications?
Conduct electricity without resistance
ExplanationSuperconductors have zero resistance
#15
What is the significance of the temperature coefficient of resistance in electrical conductors?
It describes the change in resistance with temperature
ExplanationDescribes resistance change with temperature
#16
In electrical conductors, what does the term 'drift velocity' refer to?
The speed of electrons in random motion
ExplanationElectrons' random motion speed
#17
What is the concept of resistivity in electrical conductors?
The opposition to the flow of current
ExplanationResistance to current flow
#18
What is the main factor influencing the choice of a conductor material in high-frequency applications?
Skin effect
ExplanationSkin effect is crucial in high frequencies