Question

An ammeter should have very $........$ resistance.
$\left( A \right){\text{ low}}$
$\left( B \right){\text{ high}}$
$\left( C \right){\text{ equal to resistor}}$
$\left( D \right){\text{ None of these}}$

Answer 1

Hint: Ammeter is a device which is used to measure the flow of current. Generally it measures the DC but the AC ammeters are also available. So by using the above statement we will be in a situation to answer this question.

Complete Step By Step Answer:
We knew the reason behind the ammeter, the appropriate response would have been straightforward! It is a device to measure current. A device which estimates current necessities to have a low resistance(close to zero) so that probably some measure of the current flows through it and the current can be estimated near the original value.
If the resistance of the ammeter is high at that point, the magnitude of the current coursing through it would be unquestionably lesser than that of the original current moving through the wire and consequently prompts wrong estimation of current.
No device can have zero resistance aside from superconductors.
In this manner, a device which measures current, for example, an ammeter, should have low resistance.

Note:
The overall idea is that if we insert a measuring device into a circuit, the device should have insignificant effect on the circuit surroundings (preferably, zero effect). Since an ammeter is inserted in series with a circuit branch, its occurrence would be “invisible” only if it had zero resistance.