Frayed cables
When a cable is frayed, the insulation around the wire(s) has worn down, this exposes live wires which would potentially conduct electricity, if you come into contact with a live wire you could get electrocuted.
Long cables
Long cables are easily tangled which increases resistance, they also pose a trip hazard. Also, as they are longer, they have a higher risk of overheating (you do not need to know why, you just need to know that they do)
Damaged plugs
If a plug is damaged, some of the safety features may be broken. This is hazardous.
Water around sockets
Water is a very good conductor of electricity. If energy from the circuit gets into the water it can flow through the water creating an electrocution risk
Pushing metal into sockets
Metal, like water, is also a conductor of electricity Therefore, is energy from the current touches metal the energy will travel through the metal, anyone touching/holding the metal with the current running through it may be electrocuted.
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