Power Flashcards
What is power measured in
Watts
Define electrical power
The rate of doing work
How many watts make 1 horsepower
746 watts
What is the danger of passing constant high current through a conductor
The conductor heats up
Two types of fuses
Cartridge fuse
Specialist fuse (fuse link)
What does the fuse protect
The power supply and the equipment
What happens to the the quarts powder in a HRc fuse when it blows
The powder soldifys on the fuse ends and stops arcing as it’s an efficient insulator
What is the electrical potential of the sea
0 Volts
Three things that can cause an earth fault
Dampness
Accidental damage
Insulators hardening
Why is equipment earthed to the hull of a ship
As it’s virtually impossible for someone to get a shock by touching the casing because everything goes into the sea
