Introduction to Galvanometers

The video introduces a galvanometer, an instrument that uses electromagnetism to measure small currents. It consists of a coil of wire around iron, connected to a needle, which moves in response to current flow. The video explains how the needle's movement correlates with current strength and highlights the galvanometer's role in devices like ohmmeters and voltmeters for measuring voltage in circuits.

What is the primary function of a galvanometer?

• To measure temperature

• To measure resistance

• To measure small currents

• To measure light intensity

What component of the galvanometer is responsible for its movement?

• A battery

• A spring

• A light sensor

• A coil of wire

How does the needle of a galvanometer move?

• By solar energy

• By wind

• By gravitational pull

• By current flowing through a magnetic field

What happens to the needle of a galvanometer as the current increases?

• It moves more

• It moves randomly

• It moves less

• It stays still

In which devices are galvanometers used to measure voltage?

• Spectrometers and hygrometers

• Ohmmeters and voltmeters

• Ammeters and oscilloscopes

• Thermometers and barometers