EEI TECH EEI Tech Electrical Concepts 1 — Questions and Answers
Question 1: What does Ohm's Law state?
- Voltage equals power divided by current
- Voltage equals current multiplied by resistance (Correct answer)
- Power equals voltage divided by resistance
- Current equals resistance divided by voltage
Correct answer: Voltage equals current multiplied by resistance
Ohm's Law states V = I × R (Voltage = Current × Resistance).
Question 2: In a series circuit with three resistors, how does removing one resistor affect total resistance?
- Total resistance increases
- Total resistance decreases (Correct answer)
- Total resistance is unchanged
- Total resistance becomes zero
Correct answer: Total resistance decreases
In a series circuit, total resistance is the sum of all resistors; removing one reduces the total.
Question 3: What is the purpose of a fuse in an electrical circuit?
- Increase voltage
- Store energy
- Protect against overcurrent by breaking the circuit (Correct answer)
- Reduce frequency
Correct answer: Protect against overcurrent by breaking the circuit
A fuse melts and opens the circuit when current exceeds a safe level, protecting equipment and wiring.
Question 4: Which type of current flows in one direction only?
- AC (Alternating Current)
- DC (Direct Current) (Correct answer)
- Reactive current
- Inductive current
Correct answer: DC (Direct Current)
DC (Direct Current) flows in one constant direction, unlike AC which alternates direction.
Question 5: What happens to current in a parallel circuit when one branch is opened (disconnected)?
- All current stops
- Current in other branches is unaffected (Correct answer)
- Total voltage drops
- All branches open
Correct answer: Current in other branches is unaffected
In a parallel circuit, each branch operates independently; opening one branch does not interrupt others.
Question 6: The standard US residential voltage is approximately:
- 12 V
- 48 V
- 120 V (Correct answer)
- 240 V AC (single phase)
Correct answer: 120 V
Standard US residential outlet voltage is approximately 120 V AC for most outlets.
EEI TECH EEI Tech Electrical Concepts 1
What does Ohm's Law state?