Mechanical Aptitude Basic Electrical Circuits 1 Flashcards
6 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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In a series circuit with three resistors of 4 ohms, 6 ohms, and 10 ohms, what is the total resistance?
Answer: 20 ohms
In a series circuit, total resistance is the sum of all individual resistances: 4 + 6 + 10 = 20 ohms.
A circuit has a voltage of 12 volts and a current of 2 amperes. What is the resistance?
Answer: 6 ohms
Using Ohm's Law, R = V / I = 12 / 2 = 6 ohms.
Which of the following best describes a conductor?
Answer: A material that allows electrons to flow freely
A conductor is a material with low resistance that allows electrons to move freely through it; metals like copper are common examples.
What happens to current in a series circuit if one component burns out (open circuit)?
Answer: Current stops flowing through the entire circuit
In a series circuit, all components share the same single path. If that path is broken anywhere, current cannot flow at all.
A light bulb is rated at 60 watts and operates on 120 volts. What current does it draw?
Answer: 0.5 amperes
Using P = V × I, rearranged to I = P / V = 60 / 120 = 0.5 amperes.
Which component in a circuit is designed to protect against excessive current by breaking the circuit?
Answer: Fuse
A fuse contains a thin wire that melts and breaks the circuit when current exceeds a safe level, protecting other components from damage.