What switches off power automatically when an electrical circuit is overloaded?
AnswerCircuit breaker
A circuit breaker trips to cut power when too much current flows.
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Home facts & stats
7 fact-checked facts about home systems and household science, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
A range hood is usually found in which room?
AnswerKitchen
A range hood sits above a stove to remove smoke, steam and odors.
Going deeper
How does a refrigerator keep food cold?
AnswerIt moves heat from inside to the outside
A refrigerant absorbs heat inside and releases it through coils on the outside.
Which unit is used to measure household electricity use on a bill?
AnswerKilowatt-hour
A kilowatt-hour is the energy used by a 1,000-watt device running for one hour.
Why is a smell added to the natural gas piped into homes?
AnswerSo leaks can be noticed
Natural gas has no smell of its own, so an odorant is added to help people detect leaks.
Expert level
What is the standard mains electricity frequency in North America?
Answer60 hertz
North American grids run at 60 Hz, while most of Europe uses 50 Hz.
What is the active ingredient in common household chlorine bleach?
AnswerSodium hypochlorite
Household chlorine bleach is a dilute solution of sodium hypochlorite.
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