Methods of Producing Electricity

Question 1

What is Electromotive Force (EMF)? What six methods of EMF?

Answer 1

Electromotive Force (EMF) is the work per unit charge done by a source of energy on electric charger to move against an electric field.
The six methods are friction, chemical, pressure, heat, light and magnetism

Question 2

Definite Friction

Answer 2

Friction also known as TRIBOELECTRIC EFFECT is when two dissimilar bodies are rubbed together causing one to transfer electrons to the other.

Question 3

Definite Chemical

Answer 3

Chemical also known as ELECTROCHEMICAL EFFECT is when molecules are broken and elements recombine to form different molecules, which energy is either absorbed or given off.

Question 4

Definite Pressure

Answer 4

Pressure also known as PIEZOELECTRIC EFFECT is ability of certain materials to generate an electric charge in response to applied mechanical stress.

Question 5

Define Heat

Answer 5

Heat also known as THERMOELECTRIC EFFECT uses temperature differentials in two dissimilar metals to generate voltage. A device used for temperature-sensing is called a thermocouple.

Question 6

Definite Light

Answer 6

Light also known as PHOTOVOLTAIC EFFECT is when photons give extra energy to a material that causes electrons to move from the atoms causing current flow. Calculators use photovoltaic cells.

Question 7

Define Magnetism

Answer 7

Magnetism also known as MAGNETOELECTRIC EFFECT occurs when a magnet creates a electric field by moving along a conductor that causes the positive and negative charges to seperate that induces a voltage at the ends of the conductor.