Safety Device Definition Science. The condition of being safe from undergoing or causing hurt, injury, or loss. It is designed to allow current through the circuit, but in the event that the current exceeds some maximum value it will open, severing the circuit.
Mains electricity uses earthing as a safety measure. The fuse breaks the circuit if a fault in an appliance causes too much current to flow. Condom, rubber, safety, safe, prophylactic (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse.
The earth wire usually carries no electricity.
If the outer casing (the outside bit) of an appliance is made of metal (a good conductor) then it can be made safe by earthing. A device designed to prevent injury or accidents. Science experiment safety precautions the ‘safety rules’ below have been taken and adjusted from the school of chemistry teaching laboratory safety rules for undergraduates. Book chapter full text access.