Yes the rated voltage is a maximum. A 250 v cord might be slightly thicker than one for 125 v.
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The voltage rating of an electrical extension cord is the insulation factor of the cord. These cords come in two insulation ratings, 300 volts and 600 volts. If the voltage rating is within the parameters of the cord maximums then it is safe to use it on that voltage. The amperage of the cord is based on the wire size of the cord's conductor. The rating of 10 amps will fall within the #14 cord size. Remember the longer the cord the larger the wire size should be to prevent voltage drop at the connected load end.
Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.
Sure
Yes. The cord only transmits the power. Whatever that goes in is what comes out.
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.
Yes, a 110 volt device can be plugged into a 125 volt receptacle. The voltage rating on the receptacle is only there as the highest voltage supply that the manufacturer recommends their equipment be connected to.
Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.
If the device you are powering requires 7 amps of power, then no. You will need to find a replacement cord with 7 amps. Check the power input requirements of the device to find out.
Sure
Yes. The cord only transmits the power. Whatever that goes in is what comes out.
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.
You need to define what you mean by 2.0 and 1.6.
You tell yourself the 125 volt receptacle is a 120 volt receptacle. They're the same thing.
Yes.
NO! There are 50 bulbs in a 2.5 volt string or 125 volts. There are 35 bulbs in a 3.5 volt string or 122.5 volts. If you put 50 3.5 volt bulbs in you will have 175 volts and most american house have 110 volt service so you will have dim bulbs.
Yes and no. The voltage rating of the cord and appliance are compatible, so that's not an issue. However, the cord must be thick enough to handle the maximum load the appliance will draw (amperage). Thicker cords (lower wire gauge) can handle more current. Running high draw 120V appliances, such as toasters, microwaves, window AC units and especially hair dryers on extension cords or undersized wiring is a serious fire and shock risk. Special heavy duty appliance cords (usually 10 gauge wire and <10' long) are available for 120V applications at most hardware stores. Ideally, the cord would be hard wired into the appliance, and not be excessive in length. The ground pathway, if applicable, should be maintained as well.
Yes, a 110 volt device can be plugged into a 125 volt receptacle. The voltage rating on the receptacle is only there as the highest voltage supply that the manufacturer recommends their equipment be connected to.
A 15 amp 125 volt outlet is a household outlet.