What is the difference between an ammeter and a voltmeter

The internal structure of the ammeter and the voltmeter are exactly the same, but because of the different measurement objects, the measurement Circuits are also different. When the voltmeter is measuring voltage, because it is connected in parallel with the load or power supply, a part of the current must be shunted. Therefore, in order not to affect the working condition of the Circuit, the internal resistance of the voltmeter should be large, and the larger the internal resistance, the larger the measurement range. Big. On the contrary, the ammeter is connected in series with the power supply or load. Only when the internal resistance of the ammeter is very small, the current value in the circuit will not be changed. Therefore, the internal resistance of the ammeter should be very small, and the smaller the internal resistance, the larger the measuring range.