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If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
Yes, the voltage listed on the bulb is the nominal voltage and it will work perfectly on a 120 volt circuit.
You tell yourself the 125 volt receptacle is a 120 volt receptacle. They're the same thing.
Yes.
No. 140 volts on a 120 volt system is symptomatic of something wrong. On a 120 volt system, 120 volts is near the top end of the acceptable scale with 110 volts being on the lower end of the acceptable scale. The first thing that you should do is check your volt meter against another one to make sure that the readings are the same. Many times meters that get knocked about need to be recalibrated. If you know an electrician check your meter reading against what his shows using a common source of voltage at the time.
No, the 220 v and 110 v systems are designed to use a different pin layout for the plugs and sockets, to avoid possibly dangerous cross-connections. The two voltages can not be mixed and equipment for one system cannot be used on the other without a transformer.
125% of 120= 125% * 120= 1.25 * 120= 150
Yes. The cord only transmits the power. Whatever that goes in is what comes out.
all voltage is plus or minus 10% of rating
-120
125 x 120 = 15,000