I live in a little house built in 1954. It has a certain number of ungrounded receptacles.
In the context of DC power, I have some notion of the importance of polarity.
For years, all small electrical devices/accessories (i.e. extension cords) with 2-prong male plugs that I've seen have 1 wide and 1 thinner blade. To facilitate connections and minimize hassle, I've been grinding the wider to the width of the thinner blade.
This'll likely qualify as a "naive question". In the context of single-phase power and small ~120v 60 hz AC ("Alternating Current") household devices, what purpose does having 1 blade wider than the other serve?
Thanks, AQ