Download Chapter 7 and 8 Review

Chapter 7 and 8 Review
Electricity and Magnetism
What type of circuit is represented in the
following diagram?
a. parallel circuit
b. open circuit
c. series circuit
d. electron circuit
Parallel Circuit
Parallel Circuit- 2 or MORE paths
Series Circuit
Series Circuit- ONE path
Which type of electricity is demonstrated in
the picture on the right?
a. static electricity
b. current electricity
c. circuit electricity
d. current circuit
Static Electricity
Static Electricity- the accumulation of
excess electric charges on an object.
Transfer of electrons!
Any substance that can attract iron or other
magnetic materials is called a/an
a. conductor
b. insulator
c. magnet
d. electron
The current that flows in an electric circuit
carries ____.
a. chemical energy
b. mechanical energy
c. thermal energy
d.electrical energy
A transformer that increases voltage is a
____.
a. resistance transformer
b. step-up transformer
c. step-down transformer
d. voltage motor
In the United States, power lines can carry
power voltages as high as 750,000 V, a
step-down transformer reduces the
voltage to ____ for home use.
a. 60 V
b. 120 V
c. 60 Hz
d. 120 Hz
A step-down transformer is used to reduce the
voltage carried by power lines from 750,000 V to
120 V, so that we can safely use it in our
home!
A dry-cell battery produces ____.
a. an alternating current
b. the same current that a generator
produces
c. a direct current
d. both direct and alternating current
Direct Current (DC)- electrons
move from the negative terminal to
the positive terminal. ONE direction!
Alternating Current (AC)- electrons change
direction at regular intervals in a circuit.
(Alternating direction)
• The magnetic force of a magnet is ____.
a. the same at all parts of the magnet
b. strongest at the poles
c. strongest at the center
d. weakest at the poles
N
S
South Pole
North Pole
The magnetic force is
STRONGEST at the poles.
In this circuit, how much current flows
through the lightbulb?
a. 0.75 amp
b. 1.50 amps
c. 2.0 amps
d. 3.0 amps
1.5VV
0.75
I
amps
2.0
R
ohms
The bulb will light when a current supplied by at least
one 1.5 V battery is available. Which circuit will fail to light the
bulb?
In order to create static electricity, two
objects must rub together. What is the
only particle rubbed off of one object and
onto the other?
a. protons
b. neutrons
c. electrons
Remember….
Electricity is the flow
or movement of
ELECTRONS from one
place to another.
e
e
e
e
e
e
e
Which items are considered to be safety
devices that stop the flow of current
during an overload?
a.
b.
c.
d.
batteries and fuses
batteries and circuit breakers
bulbs and circuit breakers
fuses and circuit breakers
Fuse & Circuit Breaker
Prevents electrical circuits from
overheating
The strength of a magnetic force in an
electromagnet is ________ by increasing
the current through the coil.
a.
b.
c.
d.
unaffected
increased
decreased
eliminated
• The strength of an electromagnet can be
INCREASED by
– Increasing the current
– More turns in coil of wire
– Bigger iron core
25. Which pair of magnets would result from cutting this
magnet in half?
What is the voltage (VOLTS- V) of a circuit
that contains 3A of current and a 4-ohm
bulb?
a.12 V
b. 1.33 V
12V V
c. 0.75 V
3I A
4
R
Ohms
The voltage of the circuit is 10V. What
current flows through a 5-watt resistor?
a. 50A
b. 0.5A
5PW
c. 2A
I A
0.5
10
V V
LET’S DO IT AGAIN !!!!!!!