8..8 Electrical Safety With Household Electricity Flashcards
1
Q
2 common causes electrical accidents
A
Overloading, short circuits
2
Q
Overloading
A
Too many appliances to universal adapter , current too large, hot circuit, fire/explosion
3
Q
Short circuits
A
Wire has very low resistance, provides much easier path for current to flow
Nearly all current flows through wire instead of bulb/heating element
Very large current, hot circuit, fire
4
Q
Electrical safety devices
A
Fuses, circuit breakers, earth wire
5
Q
How does fuse protect circuit
A
Current too large , hot wire melts (fuse blows)
Fuse rating: max current, slightly > normal current
X reuse
6
Q
Circuit breakers
A
Current exceeds rating, switch off by itself
Switch on, restore circuit
7
Q
Earth wire / earthing
A
Connects metal casing to the ground
Current through wire instead of body
8
Q
Precautions
A
- Three-pin lugs w earth wire
- Space, x overheating
- Electrician replace damaged
- X overload
- X wet hands
- X wet places
- X use damaged
- X pull cable
- X cables , heater/stove
