Physics for IGCSE & O level - Electricity (Section 12 - No. 24)
What can happen if a current is too high in a wire?
The wire can melt.
The insulation can degrade.
The wire can cause a fire.
The power source can be damaged.
Forklaring
If the current is too high, the wire can overheat and cause various issues, including fire and damage to the power source.