Name ____________________________________________________________________ Period ______ Date ________________________
Test Review: ENERGY KEY
I will take this test on __________________________.
This review is due on __________________________.
1. What does each of the letters in the acronym MELTS stand for?
Mechanical, Electrical, Light, Thermal, and Sound
2. For each of the following energies, name the source of the energy as well as 2 conductors and 2
insulators for the energy listed.
Type of Energy
Mechanical
Key Words
Motion or movement
Electrical
Charged particles
Light
Travels in waves; empty
space
Thermal
Heat
Sound
Vibrations
Conductors
1. wire
2. paper clip
1. transparent object
(water bottle)
2. translucent object
(wax paper)
1. iron
2. copper
1. air
2. water
Insulators
1. rubber
2. plastic
1. opaque objects (book)
2. opaque objects (foil)
1. wood
2. plastic
1. foam
2. walls
3. Light energy can be reflected and it can also be refracted. What is the definition for each of these
words? Also given an example of light reflecting and refracting (your example can be a drawing).
a. Reflection – the bouncing of light off a surface
 Example – mirror, shiny spoon, tinted window
b. Refraction – the bending of light
 Example – Microscope, telescope, lens, camera,
4. Below is a list of everyday objects that reflect OR refract light. Label each object below as an object
that reflects or refracts light.
a. tinted glass windows – reflection
b. silver spoon – reflection
c. cameras – refraction
Name ____________________________________________________________________ Period ______ Date ________________________
d. bathroom mirrors – reflection
e. prism – refraction
f. telescopes – refraction
g. eyeglasses – refraction
h. a clear glass of water – refraction
i. microscopes – refraction
j. sunglasses – reflection
5. Electricity must flow in a complete circuit for a light bulb, a radio, or a TV to work. (complete or
incomplete)
6. In the space provided below, draw a picture of a complete circuit using the following items:
2 wires, a battery, and a light bulb.
7. In the space provided below, draw a picture of an incomplete circuit using the following items:
2 wires, a battery, and a light bulb.
8. A television is powered by electrical energy. This electrical energy is changed into other forms of
energy released by the television. What are these other forms of energy that are produced by
electrical energy in the TV? Explain how they are used.
Light – to see the pictures
Thermal – heat from electrical (touch a TV after it has been playing for a while… it’s hot!)
Sound – volume
9. Headphones get electrical energy from the device to which they are attached. The headphones
change this energy into what other kind of energy?
Sound energy
10. Next to each item, write if it is a conductor or insulator of heat.
a. Sweater – insulator
Name ____________________________________________________________________ Period ______ Date ________________________
b. Frying pan – conductor
c. Wooden door – insulator
d. Heater – conductor
e. Light bulb – conductor
f. Rubber – insulator
11. When you hold an ice cube in your hand, explain how heat energy moves from your hand to the
cube. What happens? Use the vocabulary word, thermal energy, to explain this.
Thermal energy travels from warm to cooler objects, which in turn, melts the ice.
12. Be creative and name an item that is:
a. Transparent – saran wrap; window
a. Translucent – wax paper; dryer sheet
b. Opaque – book; foil; wall
13. All of the following are examples demonstrating mechanical energy EXCEPT–
A an oven cooking food
B a fan blowing out air
C a boy riding a bicycle
D a girl writing with a pen
Justify your
answer.
14. What is wrong with this picture?
The negative side needs to be touching the positive side of the
battery.
15. The major source of light energy is the sun. (the sun or electricity)
16. Is this an example of reflection or refraction? How do you know?
Refraction –I know this because the image looks distorted and the light is bending.
17. A student wraps a nail with a wire several times, then the ends of the wires are attached to a
battery as shown in the picture. What is the student most likely to demonstrate with this set
up?
A The production of heat by the battery
Justify your
B The production of light by an electrical current
answer.
C The production of a magnetic field by an electrical current
D The production of sound by a vibrating battery