EIAT and NEIEP Test Electrical Theory 2 — Questions and Answers
Question 1: What is the formula for calculating electrical power?
- P = V / I
- P = V × I (Correct answer)
- P = I / V
- P = V + I
Correct answer: P = V × I
Electrical power (in watts) is calculated as P = V × I, where V is voltage and I is current.
Question 2: In a parallel circuit, the voltage across each branch is:
- Different in each branch
- The same across all branches (Correct answer)
- Zero in all branches
- Doubled in each branch
Correct answer: The same across all branches
In a parallel circuit, all branches share the same voltage because they are connected between the same two nodes.
Question 3: An inductor opposes changes in:
- Voltage
- Resistance
- Current (Correct answer)
- Power
Correct answer: Current
An inductor opposes changes in current by generating a back-EMF (electromotive force) that resists the change.
Question 4: What is the relationship between conductor cross-sectional area and resistance?
- Larger area means higher resistance
- Larger area means lower resistance (Correct answer)
- Area does not affect resistance
- Resistance doubles as area doubles
Correct answer: Larger area means lower resistance
A larger cross-sectional area provides more paths for electron flow, reducing overall resistance.
Question 5: Which material is the best electrical conductor?
- Aluminum
- Iron
- Silver (Correct answer)
- Copper
Correct answer: Silver
Silver has the highest electrical conductivity of all metals, though copper is more commonly used due to cost.
Question 6: What does EMF stand for in electrical theory?
- Electrical Magnetic Force
- Electromotive Force (Correct answer)
- Electromagnetic Field
- Electron Motion Factor
Correct answer: Electromotive Force
EMF (Electromotive Force) is the energy provided by a source per unit charge and is measured in volts.
EIAT and NEIEP Test Electrical Theory 2
What is the formula for calculating electrical power?