Question

What do we mean by ideal voltmeter amd ideal ameter?

Answer 1

A voltmeter, as its name implies, measure the potential difference (the "voltage") between two points. An ammeter measures the " electric current " (amperes) through a conductor. In a very rough sense, the voltage is like the pressure in a water pipe, while the current islike the rate of flow of water. Remember that this is reallynota.perfect analogy. But guess it makes it easier to get the idea

ideal voltmeter
An ideal voltmeter has infinite impedance, no capacitance, whatever and makes perfect readings of voltage.

Today's lab voltmeters and even handheld DVM or DMMs come very close to ideal. with very very high impedances. I cannot recall having to be worried about voltmeter load for a very long time. The DC meters can be had with 5.5. 6.5 digits and more resolution.

Voltmeters are about the closest to ideal instruments we have made.

ideal ammeter

Just like voltmeters, ammeters tend to influence the amount of current in the circuits they’re connected to. However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as electrons flow through it. Note that this ideal resistance value is exactly opposite as that of a voltmeter. With voltmeters, we want as little current to be drawn as possible from the circuit under test. With ammeters, we want as little voltage to be dropped as possible while conducting current.