resistance
Higher resistance reduces current for a given voltage. This topic is part of Electricity within Science & Nature. This page currently draws on 55 supporting questions, with answers and bonus facts available below.
resistance trivia questions
Electrical resistance opposes the flow of what?
Answer: Current
Bonus fact: Higher resistance reduces current for a given voltage.
What is the SI unit of electrical resistance?
Answer: Ohm
Bonus fact: The symbol is Ω.
For a metal wire, increasing length generally does what to resistance?
Answer: Increases it
Bonus fact: Longer paths cause more collisions for moving electrons.
What rating indicates a gasoline's resistance to engine knocking?
Answer: Octane rating
Bonus fact: Higher octane fuels resist premature autoignition, commonly called knock.
Nickel is commonly added to steel to improve properties such as corrosion resistance and what?
Answer: Toughness
Bonus fact: Nickel is important in many stainless and alloy steels.
What element is added to many stainless steels to improve corrosion resistance?
Answer: Chromium
Bonus fact: Chromium forms a protective oxide layer.
What protective layer gives titanium excellent corrosion resistance?
Answer: Titanium oxide
Bonus fact: A thin oxide film forms naturally.
Gandhi is famous for promoting what form of resistance?
Answer: Nonviolent resistance
Bonus fact: He used satyagraha, civil disobedience, and noncooperation.
Abrasion resistance is a material's ability to resist what?
Answer: Wear from rubbing or scraping
Bonus fact: Hard surfaces often need strong abrasion resistance.
Which property often improves a material's resistance to scratching and wear?
Answer: Hardness
Bonus fact: Harder materials are generally more difficult to abrade.
Why is abrasion resistance important for flooring materials?
Answer: They experience repeated surface wear
Bonus fact: Foot traffic and grit can gradually wear flooring surfaces.
Mineral hardness measures resistance to what?
Answer: Scratching
Bonus fact: Hardness is a key mineral-identification property.