Identify these functions

galvanometer
step-up transformer
electric motor
generator
electromagnet
step-down transformer
commutator

Have you tried Googling these terms?

yes I have. it doesn't show up the scientific term

Hmmm -- This is what I found

http://www.google.com/#q=galvanometer++use

http://www.google.com/#q=step+up+transformer+function

Ms. Sue is right. All of these units show up on Google.

Sure! Here are the explanations for each of the functions you mentioned:

1. Galvanometer: A galvanometer is a device used to detect and measure small electric currents. It typically consists of a coil of wire suspended between two magnets, which causes the coil to move when an electric current flows through it.

2. Step-up transformer: A step-up transformer is a device used to increase the voltage of an alternating current (AC) power supply. It consists of two coils of wire wound around a common core. The primary coil has fewer turns than the secondary coil, which results in an increase in voltage from the input to the output.

3. Electric motor: An electric motor is a device that converts electrical energy into mechanical energy. It consists of a coil of wire (armature) placed between two magnets. When an electric current passes through the coil, it experiences a magnetic force, causing it to rotate and produce mechanical work.

4. Generator: A generator is a device that converts mechanical energy into electrical energy. It operates on the principle of electromagnetic induction by rotating a coil of wire in a magnetic field. The relative motion between the wire and the magnetic field induces an electric current in the wire, generating electricity.

5. Electromagnet: An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. When the current flows, it generates a magnetic field around the wire, creating a magnet with controllable properties. Electromagnets find applications in various devices, such as speakers, relays, and MRI machines.

6. Step-down transformer: A step-down transformer is a device used to decrease the voltage of an AC power supply. Like a step-up transformer, it consists of two coils of wire wound around a common core. However, in a step-down transformer, the primary coil has more turns than the secondary coil, resulting in a decrease in voltage from the input to the output.

7. Commutator: A commutator is a rotary electrical switch used in certain types of electric motors and generators. It consists of a set of copper segments, known as commutator bars, that are connected to the ends of the armature coil. The commutator allows the armature's contacts to change polarity as it rotates, ensuring the continuous flow of current in one direction.

To identify these functions, you can look for specific characteristics or components associated with each device. For example, a galvanometer will have a coil of wire and magnets, while a step-up transformer will have two coils with different numbers of turns. By examining the key features or mechanisms of a device, you can determine its function.