OAR OAR Mechanical Comprehension: Electricity Questions and Answers 2 — Questions and Answers
Question 1: A circuit contains a 12V battery and a 4-ohm resistor. What is the current flowing through the circuit?
- 3 A (Correct answer)
- 4 A
- 8 A
- 48 A
Correct answer: 3 A
Using Ohm's law (I = V/R), 12V divided by 4 ohms equals 3 amperes.
Question 2: What happens to the total resistance when resistors are connected in parallel?
- It decreases below the smallest individual resistor (Correct answer)
- It equals the sum of all resistors
- It remains the same as the largest resistor
- It doubles
Correct answer: It decreases below the smallest individual resistor
In a parallel circuit, the total resistance is always less than the smallest individual resistor value.
Question 3: Which material is the best electrical conductor?
- Silver (Correct answer)
- Rubber
- Glass
- Wood
Correct answer: Silver
Silver has the highest electrical conductivity of all elements, making it the best conductor.
Question 4: In a series circuit with three identical light bulbs, what happens if one bulb burns out?
- All bulbs go out (Correct answer)
- The other two get brighter
- Only the adjacent bulb goes out
- Nothing changes
Correct answer: All bulbs go out
In a series circuit there is only one path for current, so a break anywhere stops all current flow.
Question 5: What is the unit of electrical power?
- Watt (Correct answer)
- Volt
- Ampere
- Ohm
Correct answer: Watt
The watt is the SI unit of power, defined as one joule per second or one volt times one ampere.
Question 6: A capacitor stores energy in what form?
- An electric field (Correct answer)
- A magnetic field
- Chemical energy
- Thermal energy
Correct answer: An electric field
A capacitor stores energy in the electric field created between its two charged plates.
OAR OAR Mechanical Comprehension: Electricity Questions and Answers 2
A circuit contains a 12V battery and a 4-ohm resistor.
What is the current flowing through the circuit?