Short circuit: the current does not flow through the electrical appliances, directly connected to the two poles of the power supply, the short circuit current can reach dozens or even hundreds of times of the normal current, and its instantaneous heat generation far exceeds the heat generation of the line when it is working normally, so that the insulation layer is burned out, and the fire caused by ignition of combustibles must be cleared.
Overload of electrical circuits: The amount of current that allows continuous passage without overheating the wires becomes a safe rated current, and if the amount of current in the electrical circuit exceeds the safe rated current, the temperature of the electrical circuit will gradually increase, thereby accelerating the aging of the insulation layer and causing a short circuit**.
Poor contact: This can lead to increased resistance at the point of contact. When the current passing through is constant, there will be more electrical energy loss at the contact, resulting in a local temperature increase, igniting the plastic skin of the wire, and causing a fire.
So, how can we effectively reduce the harm caused by these unexpected situations to our lives?The electrical fire experiment is gradually entering our safe electricity teaching classroom.
Enhance fire safety awareness: Through experiments, people's awareness of the hazards and preventive measures of electrical fires can be enhanced, and fire safety awareness can be improved.
Consolidate the knowledge of safety protection: Through experiments, people's mastery of electrical fire safety protection knowledge can be consolidated, and the ability to respond to emergencies can be improved.
Promote scientific and technological progress: Electrical fire experiments can promote technological progress in related fields, improve the ability of electrical fire prevention and control, and provide more scientific and accurate means and methods for fire safety work.
In short, the electrical fire experiment is of great significance for improving people's fire safety awareness, prevention ability, consolidating safety protection knowledge and promoting scientific and technological progress.