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[–] 1 pt (edited )

You can make a battery using copper pennies, some vinegar, and little cardboard. The cardboard acts as a 'sponge' for the vinegar. I use to make these batteries with my kids.

Electronics is a very good thing to understand. It saves money when you can fix or install electrical/electronic yourself. I spent many years in electronics, especially control systems.

[–] 0 pt

I was always too busy building computers over the years to take the time to read the actual textbook:)

I have the time now, and I am enjoying it immensely.