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Q: What is the inductive reactance to 1Hz in a 1H inductor?
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Will a 115V 60Hz work in a 120V 60Hz power supply?

You don't mention what device, but the answer is probably NO. 50hz and 60hz signals will act differently in reactive components such as transformers, coils, capacitors, etc. Paulev is correct that it would act differently on inductive/reactive devices, especially transformers. The device to be discussed here is the transformer as it is most present in all electronic equipment. Based on theories, a 50Hz transformer will perfectly work on a 60Hz Power system but not vice versa. Assuming the transformer's specs are, P=1kVA, L=1H, R~0 ohm. At 50Hz the impedance will be Z=sqrt(Inductive Reactance=2 x Pi x 50 x L), thus the ampacity (Ip=sqrt(P/Z)) of the magnetic wire at the primary is 1.79A. Using the same steps at 60Hz. The current drawn by the the transformer will be 1.63A which is within the ampacity of the magnetic wire. therefore a 50Hz appliance can be used on a 60Hz supply without any problem.


How long will 100 watt bulb last?

Read the label on the container. The light bulb will be rated "B-10" life. This refers to a statistical number value. "B-10" Life is the average life span a bulb will last for 90% of those tested. If you went purely by the "average" time to burn out, then that is not specific. One brand of light bulbs can have a higher Average. But if it has a lot of scatter in the data, then that would mean some bulbs could fail much earlier and some much later. On the other hand, if you determine a bulb has a X hour "average" life with a minium scatter factor, then more of the bulbs will perform closer to the average. Read the label on the box.


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