electrical safety

Question 1

what are the dangers of damages insulation

Answer 1

short circuit- which will lead to heat and fire
risk of electric shock

Question 2

dangers of overheate cables

Answer 2

too much current- which will lead to heat and can cause fire

Question 3

how to prevent overheating

Answer 3

use thick copper cables which have a bigger mass and dont change temperature as much

Question 4

dangers of damp conditions

Answer 4

water conducts electricity better than air but less then metals

Question 5

dangers of excess current

Answer 5

overloading plugs and extension leads can draw too much current from the mains supply than the ires can take hwch lead to overheating cables and fire risk

Question 6

what do fuses and cause

Answer 6

duses are thin metal wires, that melt or blow when too much current flows through them, thus cutting off the circuit.
use formula P= I x V

Question 7

what do circuit breakers cause

Answer 7

circuit breakers are a similar desighn to a relay, except it opens a switch when too much current flows.
1) too much current flows- coild becomes a strong magnet
2) attracts iron catch which breaks circuit
3) circuit can be reset ( once current is smaller)