Electrical outlets can get hot when using an air conditioner and turning off the fan for a couple of reasons related to the load and current passing through the outlet.
Compressor Cycling: Air conditioners work by compressing and expanding refrigerant to remove heat from the air. When the air conditioner's compressor cycles on, it draws a higher amount of electrical current to start and run the compressor. This surge in current can cause the outlet to heat up slightly.
High Current Draw: Air conditioners generally consume more power (measured in watts) than most fans. When the air conditioner is running, it draws a significant amount of current from the outlet to power both the compressor and the fan. This increased current flow can lead to a small amount of heat being generated at the outlet's connection points.
Inrush Current: The initial surge of current that occurs when the air conditioner starts can cause a brief spike in temperature at the outlet. This inrush current is due to the initial charging of capacitors and the mechanical load required to start the compressor.
When you only turn on the fan without using the air conditioner, the current draw is significantly lower compared to the air conditioner running. Fans typically consume much less power than air conditioners, so there is less stress on the electrical outlet, resulting in minimal heating.
While it's normal for electrical outlets to feel slightly warm when in use, they should not become excessively hot. If you notice an outlet becoming very hot to the touch, it could be a sign of an electrical problem. In such cases, it's crucial to have a qualified electrician inspect the outlet and the electrical wiring to ensure there are no safety hazards or potential issues with the circuit.