How old are you?
I remember we had this at 6 class of primary school. So when we were 12.
Using an ammeter, we measured the current flowing from a 3R12 battery (4.5V) through wires of various lengths and thicknesses. For the thickest wire, the measured current was too low and I argued with the teacher that it had to be more. The lady agreed with my calculations and told everyone to write the calculated value in their notebooks. During the next lesson, however, she told us to change it to a smaller value because a 3R12 battery cannot provide 5A (theoretic result was around this).
I knew the formula for wire resistance 2-3 years earlier, but I learned about the internal resistance of the battery then.
No one asked you to tell us your story. Learn to respect people and not asking for their age.
You don’t remember at what moment this or this happened until an extraordinary event will make you remember. It was first time in my life when I argued with the teacher.
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