Unit D Section 3.1

Question 1

Scientific definition to do energy:

Answer 1

The definition of energy is the ability to do work.

Question 2

What are the 4 different types of forms of energy?

Answer 2

Chemical Energy

Electrical Energy

Mechanical Energy

Thermal Energy

Question 3

What is chemical energy?

Answer 3

The energy is stored in chemicals. This is a form of potential or stored energy. This energy is released when chemicals react.

• Chemical energy is the energy that is found in chemicals, including food
• Glucose produces energy in our bodies. Our cells have chemical reactions with glucose to produce thermal energy to keep warm and mechanical energy.

Moving muscles is a form of chemical energy.

Thermal energy is constantly produced by chemical reactions in our bodies.

Question 4

What is Electrical Energy?

Answer 4

The energy of charged particles. Electrical energy is transferred when electrons travel from place to place.

Question 5

What is Mechanical Energy?

Answer 5

The energy occurs when an object has a motion or potential to move.

Question 6

What is Thermal Energy?

Answer 6

In another way is known as heat. The total kinetic energy of all particles in a substance. The faster the particle the more kinetic energy.

Question 7

How is using a cd chemical energy?

Answer 7

-when you use a battery-operated CD player, you are transforming chemical energy into other forms.
-Dry cell contains chemicals that react to produce electrical energy.
The CD player transforms this electrical energy into mechanical and sound energy

Question 8

How are explosive a form of chemical energy?

Answer 8

Another example of chemical energy is explosives to the demolishment of large buildings.
The chemical energy in dynamite is released to provide the mechanical energy that demolishes the building.
Energy in the demolition comes from the gravitational potential energy of the building itself

Question 9

Electrical energy to mechanical energy:

Answer 9

anything that needs a battery or a dry cell to operate is a converted FROM chemical energy because of the chemical energy, not mechanical energy.

Question 10

Input Energy: Device =

Electrical toaster =

Answer 10

Output energy:

Thermal

Question 11

Input Energy: Device =

Chemical flashlight =

Answer 11

Output energy:

electrical to light to thermal

Question 12

Input Energy: Device =

Electrical blender =

Answer 12

Output energy:

mechanical

Question 13

Input Energy: Device =

Chemical battery clock =

Answer 13

electrical to mechanical to sound

Question 14

A thermocouple/ thermophile?

Answer 14

is a device that converts thermal energy into electrical energy. It consists of two different metals joined together that conduct heat.

Question 15

What are the advantages of thermocouple?

Answer 15

A thermocouple can be used as a thermometer because the temperatures affect the amount of electricity being produced.

Thermocouples can be used in areas where it is difficult to access or too hot for thermometers.

Ex. farmers use s hang thermocouple cables in their grain bins. To indicate if the grains are getting too hot or moist.

Question 16

Electrical energy to thermal energy:

Examples

Answer 16

Devices such as heaters or ovens do the opposite of thermal couples.

They convert electrical energy into thermal energy.

Electrons move through metals. The metal heats up and warms the oven

Question 17

Ocean Thermal Energy Conversion:

Answer 17

The temperature difference between the warm surface and cold depths.

This difference can be used to make electricity through ocean thermal energy conversion.

Question 18

Piezoelectricity:

Answer 18

Piezo – in Greek means pressure

Piezoelectric effect- A barbecue “spark” lighter uses piezoelectric effect in reverse.

Piezoelectric crystal acts as source of electric energy

Squeezing the handle of barbeque spark lighter slams
the piezoelectric crystal (quartz) generating some miniature lightning