Question

Why does the Ammeter get burned out when connected in parallel?
A. when voltages become high
B. a large amount of current pass through it
C. power becomes high
D. all

Answer 1

Hint: The ammeter is a device, which is used to measure the current flowing through an electrical circuit. This instrument is used to measure even small currents in an electrical circuit. This will be in the milliampere and microampere range. These details may help you to solve this question.

Complete step by step solution:
First of all, let us get to know what an ammeter is? An ammeter is an instrument used for measuring either direct current or alternating electric current. An ammeter helps us to calculate electrical current by measuring the current through a number of certain coils which possess a very low resistance and inductive reactance. We must use an ammeter in series when we are connecting the circuit in order to measure the current. So basically ammeter has a very low resistance which is nearly zero. If it is connected in parallel, it would take up most of the current and it would get damaged. If an ammeter is connected in parallel because of the low resistance, it will be acting as a short circuit. Thereby the ammeter gets damaged first. Therefore the correct answer is given as option B.

Note: An ammeter can measure a big range of current values because at larger values only a small amount of the current is directed through the meter. This is due to the shunt resistance which is connected parallel with the device. It is carrying the major portion of the current. The least amount of impedance of the ammeter is resulting in the least loss of power.