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.
What is the chemical name of baking soda?
AnswerSodium bicarbonate
Baking soda is sodium bicarbonate, which releases carbon dioxide when mixed with acid.
A microwave oven heats food mainly by making which molecules move faster?
AnswerWater
Microwaves make water molecules in food rotate rapidly, and that motion becomes heat.
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 does the R-value of home insulation measure?
AnswerResistance to heat flow
A higher R-value means the material resists heat flow better.
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