Before voltage and resistance mean anything, you need to know what's actually moving in a wire, and how fast.
Everything is made of atoms, and atoms contain tiny charged particles called electrons. In a metal wire, some of these electrons are free to drift from atom to atom. That drifting is electricity.
Charge is measured in coulombs (C). You won't often deal with a single electron's charge — instead you deal with a "packet" of charge flowing past a point, the way you'd count litres of water flowing past a point in a pipe rather than counting molecules.
Current isn't "how much charge" — it's how much charge flows past a point per second. That's the key idea people mix up: a current can be small even if a huge amount of charge eventually moves, if it just takes long enough.
I = Q / t
Where I is current in amperes (A), Q is charge in coulombs (C), and t is time in seconds (s). One ampere means one coulomb of charge is flowing past a point every second: 1 A = 1 C/s.
A charge of 12 C flows past a point in a wire in 4 s. What is the current?
I = Q / t = 12 ÷ 4 = 3 A
An ammeter measures current, and it's always connected in series — directly in the path the charge travels, like a tollbooth on a single road. A good ammeter has almost zero resistance of its own, so it counts the charge going past without slowing it down or changing the circuit it's measuring.
Careful — the formula uses seconds, and the question gives minutes. 2 minutes = 120 s.
Q = I × t = 0.5 × 120 = 60 C