OAR Mechanical Comprehension: Electricity Questions and Answers Flashcards
6 cards from real OAR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 OAR Mechanical Comprehension: Electricity Questions and Answers flashcards as text
A circuit contains a 12V battery and a 4-ohm resistor. What is the current flowing through the circuit?
Answer: 3 A
Using Ohm's law (I = V/R), 12V divided by 4 ohms equals 3 amperes.
What happens to the total resistance when resistors are connected in parallel?
Answer: It decreases below the smallest individual resistor
In a parallel circuit, the total resistance is always less than the smallest individual resistor value.
Which material is the best electrical conductor?
Answer: Silver
Silver has the highest electrical conductivity of all elements, making it the best conductor.
In a series circuit with three identical light bulbs, what happens if one bulb burns out?
Answer: All bulbs go out
In a series circuit there is only one path for current, so a break anywhere stops all current flow.
What is the unit of electrical power?
Answer: Watt
The watt is the SI unit of power, defined as one joule per second or one volt times one ampere.
A capacitor stores energy in what form?
Answer: An electric field
A capacitor stores energy in the electric field created between its two charged plates.