An existing cord that you use for a lamp is much thinner than an extension cord recommended for use with large appliances. if u plugged in a refrigerator using a lamp extension cord, the plastic coating of the cord could melt and perhaps start a fire. why does this occur? how can this hazard be prevented?

The smaller wire means higher resistance and that causes more heating of the wire to occur. If the wire becomes too hot it can ignite. This can be prevented by using the proper cord to hook the refrigerator to the electrical outlet.

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The reason the plastic coating of a lamp extension cord could melt and potentially start a fire when used with a refrigerator is due to the difference in current requirements between the two types of appliances.

A lamp typically requires much less power and draws a lower amount of electrical current compared to a large appliance like a refrigerator. The extension cord designed for a lamp is made with thinner wires and insulation that is suitable for the lower current rating.

When a refrigerator, which requires higher power consumption, is connected to a lamp extension cord, it draws more current than the cord is designed to handle. This causes the wires to heat up, and the insulation may not be able to handle the excess heat. Consequently, the plastic coating can melt, exposing the hot wires, and increasing the risk of fire.

To prevent this hazard, it is crucial to use an extension cord that is specifically designed for large appliances like refrigerators. These cords are typically thicker and have a higher current rating, which can handle the power requirements of the appliance. Look for extension cords labeled as "heavy-duty" or "appliance cords", which are designed for higher currents.

Additionally, it is always safer to directly plug appliances like refrigerators into properly grounded wall outlets, rather than relying on extension cords. This ensures that the electrical circuit is capable of handling the power demand without the risk of overheating extension cords. If the distance to the outlet is too far, it is recommended to have a qualified electrician install a dedicated outlet closer to the appliance.

Remember, using the correct extension cords and not overloading them is essential for safety, as it reduces the risk of electrical hazards and potential fires.