Clarification_impedance

 A lady asked me about impedance; said it was not clear in her mind. In short,

resistance is what we find in a direct current DC, and impedance in alternating

current AC. And the formula for Ohm's Law is different in each case. In direct

current DC, current is equal to voltage divided by resistance. In alternating current

AC, current is the product of voltage multiplied by impedance!

                                                                              

                  

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So, in the case of a typical household the impedance of the circuit is not an issue,

but the performance rating of the wires is...

                                                                            

Amperage and Wire Gauge Chart: What Size You Need (thespruce.com)

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For the pros:

https://comprendreconstruire.wordpress.com/electricite/entree-electrique/

Household Electric Circuits (gsu.edu)