Question

Name the device which detect the presence of electric current

Answer 1

➡Galvanometer is a device which is used to detect and measure electric current.⬅

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Answer 2

Answer: An electromechanical device used to measure electric current is a galvanometer. Early galvanometers were not calibrated, but later models, known as ammeters, were introduced, and could measure current flow more precisely.

Explanation:

Here it is illustrated that how galvanometer functions:

• A pointer is deflected by a galvanometer when an electric current passes through a coil in a persistent magnetic field. One way to think of galvanometers is as an actuator.
• In the field of a permanent magnet, a small pivoting coil of wire known as a spindle is used to build modern galvanometers of the D'Arsonval/Weston type. A narrow pointer that travels across a calibrated scale is linked to the coil. The coil and pointer are pulled to the zero position by a small torsion spring.
• Direct current (DC) passing through a coil causes the coil to produce a magnetic field. The magnetic field works against the magnet permanently. The pointer moves as a result of the coil twisting and pressing against the spring.
• The hand indicates an electric current scale with its finger. The magnetic field is uniformly created by the careful construction of the pole pieces, causing the pointer's angular deflection to be proportional to the current. 
• The mechanical resonance of the moving coil and pointer is typically dampened by a feature in an usable metre, allowing the pointer to swiftly settle into place without oscillation.

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