Yes, it can.
Our bathroom GFI trips, when my wife uses one particular hair drier.
yes
If your spa is connected with a GFCI circuit breaker you will not need the GFCI receptacle.
Receptacles are daisy chained so that one receptacle also powers others. A GFCI is often in the first receptacle so that a fault on any other connection/receptacle will be detected and cut off by that GFCI. Trip the GFCI. Then find all receptacles and appliances now without power. A fault can be in any one or due to a combination of many slightly defective appliances.
A GFCI receptacle can pass it's "protection" to other outlets wired from it. If the GFCI trips, all outlets wired from it will "trip" also. A GFCI tripping will not necessarily trip the circuit breaker in the service panel.
You have some serious wiring problems, for sure. My first guess is that your grounding conductor and neutral are touching somewhere and your ground is acting as the neutral when the neutral is disconnected. The light coming on when the hair dryer is used is another mystery. You need to hire a competent electrician to trouble shoot these problems.
Electric motors and GFI's do not get along. the initial draw to get the compressor going is usually enough to trip the GFI. Turn the breaker off and switch the GFI for a regular outlet and you will solve your problem.
No
Yes, that is fine.
If your spa is connected with a GFCI circuit breaker you will not need the GFCI receptacle.
Receptacles are daisy chained so that one receptacle also powers others. A GFCI is often in the first receptacle so that a fault on any other connection/receptacle will be detected and cut off by that GFCI. Trip the GFCI. Then find all receptacles and appliances now without power. A fault can be in any one or due to a combination of many slightly defective appliances.
A GFCI receptacle can pass it's "protection" to other outlets wired from it. If the GFCI trips, all outlets wired from it will "trip" also. A GFCI tripping will not necessarily trip the circuit breaker in the service panel.
You have some serious wiring problems, for sure. My first guess is that your grounding conductor and neutral are touching somewhere and your ground is acting as the neutral when the neutral is disconnected. The light coming on when the hair dryer is used is another mystery. You need to hire a competent electrician to trouble shoot these problems.
If the GFI that is tripping is a different circuit, there is electrical leakage between the circuit the GFI is controlling, and the dryer circuit. It is possible that there is some cross wiring in the electrical box. I would strongly recommend getting a licensed electrician to look at it, preferably before you have a fire. If the GFI is the same circuit as the one where the dryer is plugged in, you might want to have the dryer checked for leakage to ground. You should also check the dryer circuit's rating against the rating of the breaker in its circuit. A dryer typically takes 30A on usually a single two-gang breaker; if you have a larger dryer that pulls, say, 45A, a 30A breaker will always pop. It sounds to me like a bad electrician has, instead of buying a proper two-gang 30-A breaker, installed your dryer across two circuits, one being the garage GFI circuit; the dryer, because it pulls 220V, pulls an unbalanced load across the GFI and triggers it, and the other circuit breaker is triggered because it loses the extra power provided through the GFI. I cannot emphasize this enough: get this checked out and fixed. Now. Before you get a house fire.
There are a couple things that could happen, worst of all would be harming yourself. If the dryer was plugged into a working GCFI receptacle, then nothing should happen except the little red button on the GFI would trip. They are designed to trip faster than a heart beat. If the dryer is plugged into a regular plug circuit and if the breaker is working, then it will just trip as this will cause a "short" circuit. If the breaker is not working, then most likely there will be lots of sparks because it doesn't trip. Something should trip, even the 100 amp main should go. The only time you would be in trouble is if you are in between the circuit somehow. ie, you are holding onto the tap at the same time and there is copper Plumbing, or you are holding the dryer when you put it in. My recommendation, just don't do that.... Andy The above answer is not entirely accurate. If it is a properly functioning GFI circuit then yes the GFI should trip. The key feature of GFIs is that they detect the difference between the current being supplied and the current returning. If you drop a drier in a bathtub then at least some of the current will be grounded through the plumbing (and you along the way). So the GFI should trip and they trip quickly. However if it is a regular circuit breaker then you do *not* have any guarantee that it will protect you. The water *may* short the drier and cause a large enough current flow to trip the breaker. However it may not. It could have enough resistance to limit the current below 15A or whatever the circuit breaker trips at. In which case it won't trip at all. Regular circuit breakers are there to prevent short circuits from overloading the wiring which would burn your house down. They're *not* there to prevent you from being electrocuted. You, and even a bathtub of water, have resistance which depending on various factors may be enough to avoid overloading a regular circuit breaker.
There are a couple things that could happen, worst of all would be harming yourself. If the dryer was plugged into a working GCFI receptacle, then nothing should happen except the little red button on the GFI would trip. They are designed to trip faster than a heart beat. If the dryer is plugged into a regular plug circuit and if the breaker is working, then it will just trip as this will cause a "short" circuit. If the breaker is not working, then most likely there will be lots of sparks because it doesn't trip. Something should trip, even the 100 amp main should go. The only time you would be in trouble is if you are in between the circuit somehow. ie, you are holding onto the tap at the same time and there is copper plumbing, or you are holding the dryer when you put it in. My recommendation, just don't do that.... Andy The above answer is not entirely accurate. If it is a properly functioning GFI circuit then yes the GFI should trip. The key feature of GFIs is that they detect the difference between the current being supplied and the current returning. If you drop a drier in a bathtub then at least some of the current will be grounded through the plumbing (and you along the way). So the GFI should trip and they trip quickly. However if it is a regular circuit breaker then you do *not* have any guarantee that it will protect you. The water *may* short the drier and cause a large enough current flow to trip the breaker. However it may not. It could have enough resistance to limit the current below 15A or whatever the circuit breaker trips at. In which case it won't trip at all. Regular circuit breakers are there to prevent short circuits from overloading the wiring which would burn your house down. They're *not* there to prevent you from being electrocuted. You, and even a bathtub of water, have resistance which depending on various factors may be enough to avoid overloading a regular circuit breaker.
Electric motors and GFI's do not get along. the initial draw to get the compressor going is usually enough to trip the GFI. Turn the breaker off and switch the GFI for a regular outlet and you will solve your problem.
No. A household receptacle is 120V. It will not work.
Are you sure it is the bulb that its blowing and not the Gfi tripping? Try resetting the gfi. Also try swithing to an incandescent bulb and test your gfi. Also test the cfl in a non-gfi outlet. Cfls return power they don't use and may make the gfi trip. I am not an electrician, just personal experience.