Fuses & earthing (Edexcel GCSE Physics Combined Science): Flashcards
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Practise the cards
13 cards from this deck
Purpose of fuses & earthing
Purpose of fuses & earthing
Prevent electrical overloads & protect against shocks/fire
Causes of electrical surges
Causes of electrical surges
Circuit changes, appliance faults with excess current
Dangers of electrical surges
Dangers of electrical surges
Wires overheat/melt (fires), electric shocks
How fuses protect circuits
How fuses protect circuits
Melt & break circuit when current exceeds rating
Fuse rating
Fuse rating
Max current fuse can handle before melting
Selecting fuse rating
Selecting fuse rating
Slightly higher than normal operating current
Wire fuse connects to
Wire fuse connects to
Live wire
Purpose of earthing
Purpose of earthing
Fault current flows to ground, not through person
Appliances that must be earthed
Appliances that must be earthed
All appliances with metal cases
Double insulation
Double insulation
Plastic casing with no exposed metal parts
Wires in double insulated appliances
Wires in double insulated appliances
Live & neutral only (no earth wire)
Advantage of circuit breakers
Advantage of circuit breakers
Can be reset, not replaced
Circuit breakers vs fuses: speed
Circuit breakers vs fuses: speed
Circuit breakers react faster