as a quick start you will need to know :
voltage is measured in volts (V)
and current in amps or amperes (A)
Step 1: Current and Voltage Fundamentals
current (amps) is constant throughout a series circuit and splits in a parallel circuit evenly.
current is measures using an ammeter in series and the placement of the ammeter does not matter as the current is the same anywhere in a circuit. (pictured below)