EEI TECH EEI Tech Electrical Concepts 2 — Questions and Answers
Question 1: What is the function of a transformer in an electrical system?
- Store electricity
- Convert DC to AC
- Change voltage levels (Correct answer)
- Measure current
Correct answer: Change voltage levels
A transformer steps voltage up or down using electromagnetic induction between coils.
Question 2: Which material is the best conductor of electricity?
- Rubber
- Wood
- Copper (Correct answer)
- Glass
Correct answer: Copper
Copper is an excellent conductor due to its low electrical resistance and is widely used in wiring.
Question 3: Ground fault protection is designed to protect against:
- Overvoltage
- Unintended current paths to ground that can cause shock (Correct answer)
- Low power factor
- Frequency fluctuations
Correct answer: Unintended current paths to ground that can cause shock
Ground fault protection detects unintended current paths to ground, preventing electrical shock and fire.
Question 4: A circuit breaker differs from a fuse in that a circuit breaker:
- Cannot be reset
- Can be reset after tripping (Correct answer)
- Only works on DC circuits
- Has no overcurrent rating
Correct answer: Can be reset after tripping
Unlike a fuse that must be replaced after opening, a circuit breaker can be manually reset.
Question 5: What unit measures electrical resistance?
- Volt
- Ampere
- Watt
- Ohm (Correct answer)
Correct answer: Ohm
Electrical resistance is measured in ohms (Ω), named after Georg Simon Ohm.
Question 6: In the formula P = V × I, what does 'P' represent?
- Pressure
- Power in watts (Correct answer)
- Potential difference
- Phase angle
Correct answer: Power in watts
P = V × I is the power formula where P is electrical power measured in watts.
EEI TECH EEI Tech Electrical Concepts 2
What is the function of a transformer in an electrical system?