Steve4Physics has made some really wonderful videos on Youtube. I wanted to make some notes privately at first but I thought I might as well share them on my blog so that somebody else can see them (and to avoid losing them myself).

+ve = Positive Charge (Proton) 1.60×10-19C
-ve = Negative Charge (Electron) -1.60×10-19C

Material becomes charged by gaining or losing electrons.

Like charges repel one another, but unlike charges attract one another.

SI = Coulomb (C).

Elementary Charge (e) = 1.60×10-19C (proton’s)

Electron’s Charge = -1.60×10-19C

6.25 x 10^18 Protons per C

Symbol for the amount of charge is Q or q

Current is:

The movement (Flow) of charge.

Don’t use amperage, use current.

Charge carriers = Whatever particles are moving and causing the current.

Conventional current = Imaginary current. Flows from the positive to the negative
as if the charge carriers we positive.

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An AMP is equivalent to saying how many Coulombs (C) per second.

The SI unit for current is an ampere (AMP)

1 AMP is 1 Coulomb (C) per second.

To measure a current we use an ammeter.

I’ve chosen one I found on Amazon, it’s the Multimeter, Crenova MS8233D Auto Ranging Digital Multimeter AC Voltage Detector Portable Electronic Measuring Tester

We use the symbol I for current. E.g I = 2.0 Amp