Answer
The ammeter must be connected in series with an element so that it can measure the total current that flows through that element of the circuit.
Since sections of the circuit which are in parallel have the same potential difference, the voltmeters is placed in parallel with the element that is being measured.
Work Step by Step
Ammeters measure the current flowing through circuit elements. The same current flows through two elements when they are connected in series. Therefore, the ammeter must be connected in series with an element so that it can measure the total current that flows through that element of the circuit.
Voltmeters measure the potential difference between two points in a circuit. Since sections of the circuit which are in parallel have the same potential difference, the voltmeters is placed in parallel with the element that is being measured.
