INSTITUTO MONTESSORI ANÁHUAC
JR. HIGH DIVISION
SCIENCE-PHYSICS
ELECTRICITY REVIEW
NAME: ____________________________________________________ GROUP:______ DATE:___________
I.
MATCH THE CONCEPT WITH THE CORRECT DEFINITION.
Electrical Charge
Materials that allow an electrical current
to pass through them.
Electrical current
Is the part of the electrical circuit that
resists the flow of electricity. The unit
used to measure it is the ohm (Ω).
Conductors
Resistance
Is produced when an atom loses or gains
an electron. It can be positive, negative,
or neutral. The unit to express it is the
coulomb (C)
Ampere
Is the unit used to measure electrical
tension, also called “difference of
electrical potential” (V)
Voltage
Are materials that do not easily transmit
heat, cold or electricity.
Insulator
II.
IS the unit to measure the current
intensity. (A)
Is the movement of negative charges
(electrons) through a conductor.
COUNT THE POSITIVE AND NEGATIVE CHARGES AND WRITE IN THE LINE
IF IT HAS A POSITIVE CHARGE, A NEGATIVE CHARGE OR IF IT IS
NEUTRAL.
III.
LOOK AT THE FOLLOWING INFORMATION AND COMPLETE THE
SENTENCES.
1. In Picture 1, does the balloon have a positive charge, negative charge, or no charge?
2. In Picture 1, does the cloth have a positive charge, negative charge, or no charge?
3. In Picture 2, does the balloon have a positive charge, negative charge, or no charge?
4. In Picture 2, does the cloth have a positive charge, negative charge, or no charge?
5. If you place small pieces of tissue paper near the balloon in Picture 2, they would probably stick to
the balloon. Explain why.
IV.
ANSWER THE FOLLOWING QUESTIONS.
1. A material that lets electricity pass through it is called ...
A) an electrical conductor
B) an electrical insulator
C) an electrical appliance
2. A material that does NOT let electricity pass through it is called...
A) an electrical conductor
B) an electrical insulator
C) an electrical appliance
3.
A)
B)
C)
Which of the following materials is an electrical conductor?
Silver
Silver-colored plastic
Cork
4.
A)
B)
C)
Which of the following materials is an electrical insulator?
Aluminum
Gold
Rubber
5.
A)
B)
C)
Why is a bulb brighter when it is powered by two batteries rather than one?
Because the flow of electricity in the circuit is less
Because the flow of electricity in the circuit is the same
Because the flow of electricity in the circuit is greater
6.
A)
B)
C)
Why is electrical wiring usually made from copper?
Because copper is shiny
Because copper conducts electricity
Because copper is not magnetic
7.
A)
B)
C)
Why is electrical wiring usually covered with a layer of plastic?
To make it look pretty
To help electricity flow along the wire
To make it safe
V.
CHOOSE THE BEST OPTION FROM THE BOX AND COMPLETE THE
SENTENCES.
electric current
rubber
1.
glass
resistor
insulators
copper
conductors
silver
The flow of electricity is an
2.
.
are materials that electrical current cannot pass through.
3.
are materials that electrical current can easily pass through.
4.
and_____________________ are examples of
materials that are conductors.
5.
and
are examples of
materials that are insulators.
6.
A
but does not stop it.
is a material that cuts down the flow of current