15 or 20 amp outlets are both code compliant in residential applications on a 15 or 20amp circuit.
Outdoor rated outlets are identified by a "WR" on the box or on the outlet itself. Weather Rated
Breakers will trip during an overload or short circuit. They can then be reset if the trip was caused by an overload and a device has been removed from the circuit. A fuse will provide the same protection but is a one time device. Once it is overloaded or shorted, it must be replaced.
If a breaker is tripped, it will be in the center position. Push the breaker to the off position and then back to the on position. If the breaker trips again, there is a problem in the circuit and needs to be checked by an electrican.
Surge protection is what it says it is. It protects the device plugged into it, or the entire panel if panel protection is installed, from surges coming in from the utility. Surges are very detrimental to circuit boards. Almost all appliances today have these circuit boards in them so surge protection is a must with today's devices.
There are several reasons that you may hear a hum. Older AFCI breakers sometimes do this. A load, like a heat pump starting up, can cause a hum. If you hear the hum when a large load comes on, it could be that the start up current is at the max of the circuit breaker. Once motors get old, they draw more load on start up.
AFCI breakers will sometimes get warm. If the breaker is hot, there is probably a loose connection somewhere in the circuit and should be checked by an electrician.
If the device you plug into the outlet is loose once it's plugged in. If there is discoloration on the outlet.
Today's refrigerators should be on a dedicated circuit.
A bad ballast. The most common remedy today is to remove the ballast and install LED lamps. This should be done by an electrician because there is potential for a fire if installed incorrectly.
Yes if it is a standard dimmer. If it is a smart dimmer, it will require there to be a neutral in the switch box.
Kitchens, bathrooms, garages, unfinished spaces, work shops and outdoor outlets.
One is for test, to make sure that the GFCI is working properly and the other is to reset the GFCI. Per manufactures directions this should be done once a month.
Standard breakers look for short circuits and overloads. An AFCI looks for these as well but also looks for any arcing that can be caused by a defective cord, cut conductor or any arcing in the circuit that is above a set standard. The AFCI stands for arch fault circuit interrupter.