Michael P. answered 05/15/16
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PhD in Chemistry - Application of Physics to Chemical Systems
Sara,
An ammeter measures current in amps passing through it. It is a low resistance device that is placed in series with resistors in a circuit. Placing it erroneously in parallel to a resistor (between the terminals of a resistor) provides a low resistance path around the resistor that does not drop the voltage as expected. The measured current is smaller and inaccurate, and the higher available voltage could damage any voltage-sensitive devices in the circuit.
Michael.