Electricity and Circuits Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electricity and Circuits flashcards as text
In a series circuit with three identical light bulbs, what happens to the others if one bulb burns out?
Answer: They go out
A series circuit has one path, so a break at any bulb stops current to all.
What is the unit of electrical resistance?
Answer: Ohm
Resistance is measured in ohms, symbolized by the Greek letter omega.
Using Ohm's law, what current flows through a 10-ohm resistor connected to a 20-volt source?
Answer: 2 amps
Current equals voltage divided by resistance, so 20 V ÷ 10 Ω = 2 A.
Which material is the best conductor of electricity?
Answer: Copper
Copper has many free electrons, making it an excellent conductor used in wiring.
In a parallel circuit, how does the voltage across each branch compare?
Answer: It is the same across each branch
Each branch of a parallel circuit receives the full source voltage.
What device protects a circuit by breaking the connection when current is too high?
Answer: Fuse
A fuse melts and opens the circuit when excessive current flows, preventing damage.
What does a battery provide to a circuit?
Answer: Voltage (electromotive force)
A battery supplies the voltage that pushes current through a circuit.