Several situations of short circuit of light bulb

A short circuit in the power supply means that the current flows directly from the positive electrode to the negative electrode through a wire without passing through any electrical appliance. The short circuit current may cause mechanical and thermal damage or destruction to the power supply. Short circuit is usually a serious accident and should be prevented as much as possible.
A short circuit in an electrical appliance is also called a partial circuit short circuit, which means that a wire is connected to both ends of the appliance. If this appliance is short-circuited, it is easy to burn other appliances. The short circuit is often caused by insulation damage or careless wiring.
Short circuits sometimes generate large currents of tens of thousands or even tens of thousands of amperes, which can generate a large amount of heat and damage equipment. Arcs can melt many components for a short time, and the generated current can also bring a certain amount of electromagnetic force.