3E031 Electrical CDC Vol. 1 Questions
and Answers Already Passed
Why are fuses used in electrical circuits?
✔✔To protect the circuit by breaking the connection when excessive current flows.
What happens when an open circuit occurs?
✔✔The flow of current stops because the electrical path is broken.
Why is the color coding of wires important?
✔✔It helps identify the purpose of each wire, ensuring safety and proper connections.
What tool is used to check the continuity of a circuit?
✔✔A multimeter or continuity tester.
What is a conductor's primary property?
✔✔It allows the flow of electrical current with minimal resistance.
1
,How does a resistor function in a circuit?
✔✔It limits the flow of current and controls voltage levels.
What does an ohmmeter measure?
✔✔Electrical resistance.
Why is proper cable sizing important in electrical installations?
✔✔To ensure the cable can safely carry the required current without overheating.
What is the purpose of a relay in an electrical system?
✔✔To control a high-power circuit using a low-power signal.
How does alternating current (AC) differ from direct current (DC)?
✔✔AC changes direction periodically, while DC flows in a single direction.
Why is personal protective equipment (PPE) necessary when working with electricity?
✔✔To protect against electric shock, burns, and other hazards.
2
, What is the function of a capacitor in a circuit?
✔✔To store and release electrical energy.
What should be done before working on an electrical circuit?
✔✔Ensure the circuit is de-energized and properly locked out/tagged out.
Why are circuit diagrams important for electricians?
✔✔They provide a visual representation of the electrical connections and components in a
system.
What is the purpose of an electrical junction box?
✔✔To house and protect electrical connections.
How does a ground fault circuit interrupter (GFCI) work?
✔✔It shuts off power when it detects an imbalance between incoming and outgoing current.
Why is testing for voltage critical before starting electrical work?
✔✔To confirm whether the circuit is live or de-energized for safety.
3
and Answers Already Passed
Why are fuses used in electrical circuits?
✔✔To protect the circuit by breaking the connection when excessive current flows.
What happens when an open circuit occurs?
✔✔The flow of current stops because the electrical path is broken.
Why is the color coding of wires important?
✔✔It helps identify the purpose of each wire, ensuring safety and proper connections.
What tool is used to check the continuity of a circuit?
✔✔A multimeter or continuity tester.
What is a conductor's primary property?
✔✔It allows the flow of electrical current with minimal resistance.
1
,How does a resistor function in a circuit?
✔✔It limits the flow of current and controls voltage levels.
What does an ohmmeter measure?
✔✔Electrical resistance.
Why is proper cable sizing important in electrical installations?
✔✔To ensure the cable can safely carry the required current without overheating.
What is the purpose of a relay in an electrical system?
✔✔To control a high-power circuit using a low-power signal.
How does alternating current (AC) differ from direct current (DC)?
✔✔AC changes direction periodically, while DC flows in a single direction.
Why is personal protective equipment (PPE) necessary when working with electricity?
✔✔To protect against electric shock, burns, and other hazards.
2
, What is the function of a capacitor in a circuit?
✔✔To store and release electrical energy.
What should be done before working on an electrical circuit?
✔✔Ensure the circuit is de-energized and properly locked out/tagged out.
Why are circuit diagrams important for electricians?
✔✔They provide a visual representation of the electrical connections and components in a
system.
What is the purpose of an electrical junction box?
✔✔To house and protect electrical connections.
How does a ground fault circuit interrupter (GFCI) work?
✔✔It shuts off power when it detects an imbalance between incoming and outgoing current.
Why is testing for voltage critical before starting electrical work?
✔✔To confirm whether the circuit is live or de-energized for safety.
3
