#1
What is the primary function of an electrical conductor?
Store electrical energy
Block the flow of electricity
Facilitate the flow of electricity
Generate electrical signals
#2
Which of the following materials is a good conductor of electricity?
#3
What is the purpose of an insulator in an electrical system?
To facilitate the flow of electricity
To block the flow of electricity
To store electrical energy
To generate electrical signals
#4
What is the primary purpose of a lightning rod in electrical systems?
To generate electrical signals
To store electrical energy
To facilitate the flow of electricity
To protect against lightning strikes
#5
What is the purpose of strain relief in electrical conductors?
Prevents overheating
Reduces resistivity
Protects against mechanical stress
Increases conductivity
#6
What is the primary function of a fuse in an electrical circuit?
Increase resistance
Protect against overcurrent
Facilitate the flow of electricity
Store electrical energy
#7
What is the SI unit of electrical resistance?
#8
In electrical conductors, what is the relationship between temperature and resistance?
As temperature increases, resistance decreases
As temperature increases, resistance increases
Temperature has no effect on resistance
Resistance is constant at all temperatures
#9
Which property of a material determines its ability to conduct electricity?
Density
Hardness
Conductivity
Color
#10
Which of the following metals is commonly used as a heating element due to its high resistance?
Aluminum
Copper
Nichrome
Silver
#11
What is the primary advantage of using aluminum as a conductor in power transmission lines?
Higher conductivity than copper
Lower cost and lighter weight
Better resistance to corrosion
Greater flexibility
#12
What is the effect of cross-sectional area on the resistance of an electrical conductor?
Increasing cross-sectional area decreases resistance
Increasing cross-sectional area increases resistance
Cross-sectional area has no effect on resistance
Cross-sectional area determines conductivity
#13
What is the skin effect in electrical conductors?
Increase in resistance with temperature
Concentration of current near the surface
Decrease in electrical conductivity
Expansion of conductor material
#14
What is the function of a superconductor in electrical applications?
Block the flow of electricity
Conduct electricity without resistance
Generate electrical signals
Store electrical energy
#15
What is the significance of the temperature coefficient of resistance in electrical conductors?
It indicates the ability to conduct electricity
It defines the melting point of the conductor
It describes the change in resistance with temperature
It measures the current-carrying capacity
#16
In electrical conductors, what does the term 'drift velocity' refer to?
The speed of electrons in random motion
The speed of light through the conductor
The speed of electricity in a straight line
The speed of sound in the conductor material
#17
What is the concept of resistivity in electrical conductors?
The ability to conduct electricity
The opposition to the flow of current
The temperature dependence of resistance
The electrical potential difference
#18
What is the main factor influencing the choice of a conductor material in high-frequency applications?
Resistance
Skin effect
Dielectric strength
Thermal conductivity