5 advantages of ammeter connected in series
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Assume the cell gives a voltage of 1.5v and the lamps have a resistance of 1 R each. Use Ohms law to work out the total current that would be shown on the ammeter in the series circuit. ... When more than one cell is connected in series, the total potential difference is the total of the sum of their potential difference
An ammeter is connected in series with the circuit because the purpose of the ammeter is to measure the current through the circuit. Since the ammeter is a low impedance device, connecting it in parallel with the circuit would cause a short circuit, damaging the ammeter and/or the circuit. It should be connected in series, so that maximum current can pass through it, for accurate measurement of current. Moreover its resistance is very low, if it is connected in parallel in a circuit, it will by the current, and current can not be measured accurately. If you do not connect the ammeter in series you will shunt the load, basically excluding the resistive element of the circuit.