Respuesta :
Because current is constant in a series connection, Ohm's law tells us that V=IR or I=VR, which means that the greater resistance an ammeter has, the less current will flow through it.
Therefore, the ammeter needs to have little to no resistance in order to measure the highest current flowing through the circuit. A voltmeter does not change the amount of current flowing between two places through the device; rather, it measures the difference in voltage between the two sites (for example, on opposing sides of a resistor). As a result, it will have a very high resistance, preventing current flow through it.
In order to measure potential difference and current accurately, a voltmeter with a very high resistance and an ammeter with a low resistance should be employed. Voltmeter resistance is higher than ammeter resistance. Voltmeter has a higher resistance and is linked in parallel with the main circuit so that the current in the main circuit is not altered.
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