The difference between an ammeter and galvanometer
Before we can discuss Fleming's right-hand rule we need to understand the difference between an ammeter and a galvanometer.
An ammeter is a measuring instrument used to measure the magnitude of the current in a circuit. Electric currents are measured in amperes, hence the name ammeter.
A galvanometer measures both the direction of the current and its magnitude.
Galvanometer shows 1.5 amps positive.
Galvanometer shows 1.5 amps negative.