Using Electricity: Behind the Wall
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why is household wiring connected in parallel?
- so that each appliance receives the full supply voltage
- if one appliance is switched off the others will remain on
What do main fuses protect?
the mains wiring from overheating and causing a fire if too large a current in drawn
what is circuit breakers?
automatic switches which trigger when too large a current is drawn
Why do circuit breakers have the advantage over fuses?
they can simply be reset and used again
what is the kilowatt-hour?
a unit of energy
what is a ring circuit?
a special type of parallel circuit which connects the sockets in the home
What is the advantages of a ring circuit?
- less current in each wire
- thinner cable can be used
- less risk of overheating
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