Galvanometer Functions and Principles

The video tutorial explains the galvanometer, a device used to detect current. It covers its construction, working principle, and how it can be modified into an ammeter or voltmeter. The construction involves a coil placed between magnetic poles, and the working principle is based on torque due to current. The tutorial also details converting a galvanometer into a voltmeter by adding high resistance in series and into an ammeter by adding low resistance in parallel.

What is the primary function of a galvanometer?

• To measure voltage

• To detect current

• To measure resistance

• To generate electricity

Which component of the galvanometer allows it to rotate freely?

• The permanent magnet

• The soft iron core

• The cylindrical poles

• The frictionless pivots

What is the role of the soft iron core in a galvanometer?

• To increase the magnetic field

• To decrease the magnetic field

• To provide electrical insulation

• To support the coil

What is the relationship between current and deflection in a galvanometer?

• Current is unrelated to deflection

• Current is directly proportional to deflection

• Current is exponentially related to deflection

• Current is inversely proportional to deflection

In the context of galvanometers, what does the term 'torque' refer to?

• The electrical resistance

• The rotational force on the coil

• The current flow rate

• The magnetic field strength

How is a galvanometer converted into a voltmeter?

• By connecting a low resistance in parallel

• By connecting a high resistance in series

• By connecting a low resistance in series

• By connecting a high resistance in parallel

What is the ideal resistance of a voltmeter?

• Variable resistance

• Zero resistance

• Low resistance

• Infinite resistance

What is the purpose of a shunt resistance in an ammeter?

• To maintain constant voltage

• To increase the resistance

• To decrease the resistance

• To protect the galvanometer

What is the ideal resistance of an ammeter?

• Infinite resistance

• Zero resistance

• High resistance

• Variable resistance

What happens to the effective resistance when a shunt is used in an ammeter?

• It decreases

• It remains the same

• It increases

• It becomes infinite