Question

What is the resistance of ammeter and voltmeter?

Answer 1

Hint: To answer this question, we first need to understand what resistance is. The opposition that a substance provides to the flow of electric current is known as resistance. The uppercase letter R is used to signify it. The ohm, frequently written as a word and sometimes symbolized by the uppercase Greek letter omega, is the standard unit of resistance.

Complete answer:
Ammeter:An ammeter (short for ampere meter) is a device that measures the current in a circuit. The term comes from the fact that electric currents are measured in amperes (A). The ammeter is normally wired in series with the circuit that will be used to measure the current. The resistance of an ammeter is normally low so that it does not produce a large voltage drop in the circuit being monitored.

Voltmeter: A voltmeter is a device that measures the difference in electric potential between two locations in an electric circuit. It is linked in a parallel manner. It has a high resistance and hence draws very little current from the circuit.

Analog voltmeters use a galvanometer and a series resistor to move a pointer around a scale in proportion to the voltage detected. Amplifier-based meters can detect voltages as low as a few microvolts. An analog-to-digital converter is used in digital voltmeters to display voltage numerically.

So, we conclude that, because a perfect ammeter should enable current to travel through it, its internal resistance will be zero. The ammeter is used to measure the current flow through a circuit when it is linked in series. Because no current should flow through the voltmeter, the internal resistance of the ideal voltmeter is infinite. The potential difference is measured by a voltmeter, which is linked in parallel.

Note: A wattmeter is a device that measures the electrical active power (or the average rate of flow of electrical energy) of a circuit in watts. For utility frequency and audio frequency power measurements, electromagnetic wattmeters are employed; for radio frequency measurements, additional types are necessary.