What is an ammeter? How is it connected in a circuit? Why should ammeter always
has low resistance?
Answers
Answer:
An ammeter(an instrument for measuring electric current in amperes.) 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.
Voltage difference means difference in the electrical potential between two points. So, when you use voltmeter, you need to provide it 2 different points (which are usually, before and after a resistance wire) Thus, the voltmeter calculates the difference in electrical potential between those 2 points.
If you connect the voltmeter in series, there are no 2 different points as you connect it on the same wire with same potential difference (potential difference is same because no additional resistance is present in it).
Explanation:
Answer:
ammeter is a measuring device used to measure the electric current .it is connected in series with a device to measure it voltage.it has low resistance because it can accurately read the current flowing in the circuit