As others said, a neutral problem. Check to see if it does it for the whole house or just for one or more breakers or if it applies just to one side of the buss bar or one of the neutral bars in the main box.
Whole house could be the main lugs or the meter or the transformer for which you would want to call the power company. Ask your neighbors if they have that problem which would point to a transformer.
Take the appliance with a motor and/or the radial arm saw around to plug ins on other circuits to see what result you get. May have to get a lamp to plug in and kick breakers off to determine which plugin goes with a breaker.
Unless you are experienced with electrical panels, you should hire an electrician.
If you can get it down to a particular circuit breaker, then you have to check all the connections. First unplug any lamps to see if that changes it. Could be one of the old receptacles with stab in connections that went bad and then you need to replace all receptacles with ones with screw terminals. Could be a broken or loose wire under a wire nut. My first choice would be a light or lamp with maybe to high a wattage bulb for the lamp holder. They get very hot and begin melting the wiring and a partially melted through neutral would act like that. Walmart carries those replacement lamp holders for a reason cause they go bad all the time. Also make sure someone didn't replace a lampholder or receptacle and switch the neutral and hot wires around(wrong polarity). The next step would be to burn through, cause a fire, and burn your house down and it could happen anytime the frig or heater kicks on and possibly while you are gone or asleep. Have you got smoke detectors and fire escapes and fire drills for the kids?
Another problem is where aluminum and copper wiring is mixed. Those connections loosen up on their own. Do you have any aluminum wiring or receptacles?
Every day the paper has a new house fire. Often by some heating device. A 1500 watt space heater could pull enough current to cause a surge through that bad neutral to burn through and take your house with it.
Look for any wire end that has a black burn spot.
Let us know what you find. And do something soon so I don't read about your family in the paper. Don't mean to scare you here but power surges are serious business.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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