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WorksheetsQuiz (1-3)
Total questions: 30
Worksheet time: 15mins
What is electricity?
A type of magnetism
A form of light energy
A form of energy from moving charged particles
A type of heat transfer
Which of the following is NOT a common application of electricity?
Powering lights
Running industrial machines
Fueling combustion engines
Supporting healthcare systems
Which of the following is NOT a key concept in the study of electricity?
Voltage
Resistance
Temperature
Current
What is the main difference between AC and DC?
AC flows in one direction, DC flows back and forth
DC flows in one direction, AC alternates direction
AC is used only in homes, DC is only for industries
DC is more powerful than AC
Which of the following is a DC source?
Power grid
Generator in a power station
Solar cell
Transformer
Why are batteries the most common DC source?
They produce high voltage
They are used only in industrial settings
They are portable and versatile
They work only with AC
How does a DC power supply differ from a DC source?
It generates electricity
It stores electrical energy
It converts input power into regulated DC output
It transmits electricity long distances
What is one disadvantage of DC current?
It is too powerful for electronics
It fluctuates too much
It is inefficient for long-distance transmission
It cannot be used in batteries
What is the most common source of AC electricity?
Car battery
Wind turbine
Solar panel
Power grid
Which of the following is a common application of DC power?
Powering refrigerators
Operating electric vehicles
Running air conditioners
Lighting in commercial buildings
What causes an electric shock?
A loud noise near the electrical circuit
Magnetic field interference
Electrical current passing through the body
Touching an insulated wire
What increases the severity of an electric shock?
The color of the wire
The length of the wire
The amount of current and duration of exposure
The voltage alone
Why is the risk of electrical hazards higher at workplaces?
Workplaces are always clean and dry
Employees do not use electrical devices
The environment is fast-paced and may include wet conditions
Most workplaces don't use electricity
What effect does wet soil have on electric shock severity?
It increases resistance and reduces shock
It prevents current flow
It has no effect
It lowers resistance and increases shock
What should you do before working on any electrical equipment?
Just wear gloves
Tag the equipment as 'Working'
Switch off power and unplug or tag it
Spray it with water
Which of the following is a correct safety practice in the lab?
Work on live circuits to save time
Use tools with metal handles
Discharge capacitors before working
Use wet cloths to clean wires
Why should electrical cords be kept off the floor?
So they are easy to see
To avoid entanglement with pets
To reduce damage and risk of shock
To keep the lab looking tidy
Which of these is a DON'T in electrical safety?
Use a power board with individual switches
Use flammable solvents near open electrical equipment
Tag defective equipment
Keep tools organized
What is the correct response if a fuse keeps blowing?
Replace it with a larger one
Ignore it and continue using the device
Replace it repeatedly
Investigate the cause and repair it
What should be avoided when checking a live circuit?
Using insulated tools
Using one hand behind the back
Using two hands to complete the circuit
Removing unnecessary items from the workspace
What is required for an electric current to be produced?
Protons moving between atoms
Free electrons moving between atoms
Neutrons moving in a nucleus
Atoms spinning rapidly
Which of the following is the best conductor of electricity?
Glass
Gold
Silver
Plastic
Why is copper commonly used in household wiring?
It's heavier than aluminum
It's cheaper than plastic
It's a good conductor and affordable
It looks shiny
What type of material is considered an insulator?
Materials that allow many free electrons
Metals like aluminum
Materials with very few free electrons
Conductive liquids
Why are plastics used to cover electrical wires?
They're good conductors
They're expensive
They prevent the wire from melting
They're good insulators, flexible, and cheap
Resistance of a conductor is directly proportional to its:
Width
Voltage
Length
Temperature only
Resistance is inversely proportional to the conductor's:
Weight
Cross-sectional area
Voltage
Temperature
Which factor does NOT directly affect the resistance of a conductor?
Material
Temperature
Color
Length
What is the unit of resistivity?
Ohm-volt
Ampere
Ohm-metre (Ω-m)
Volt-second
In the formula R=ρlA, what does ρ represent?
The resistance of the wire
The weight of the conductor
The resistivity of the material
The length of the conductor
