Assessment: Electric Current & Magnetic Effect
Answer every question, then submit to see your score and which topics to review.
Part A — Concept Questions
Which of these is NOT one of the three main effects of electric current?
EasyWhy does adding more resistors in parallel DECREASE the total resistance?
MediumWhy must an ammeter have very LOW resistance?
MediumPart B — Formula & Application
A resistor of 8 Ω has a current of 1.5 A flowing through it. Find the potential difference across it.
MediumFour resistors of 2 Ω, 3 Ω, 5 Ω, and 10 Ω are connected in series. Find the total resistance.
MediumPart C — Problem Solving
Three resistors of 6 Ω each are connected in parallel. Find the total resistance.
HardA wire with resistivity 1.6 × 10⁻⁸ Ω·m has resistance 0.04 Ω and length 5 m. Find its cross-sectional area.
HardPart D — Real-Life Application
Why do scrapyards use electromagnets rather than permanent magnets to lift and sort metal?
EasyWhy does an old-style string of series-wired Christmas lights go completely dark if one bulb burns out?
MediumPart E — Challenge
A 10 Ω resistor is connected in parallel with a very large resistance (approaching infinity). What happens to the total resistance?
Hard0/10 answered