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## Chapter 7 and 8 Review

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### 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 ... – PowerPoint PPT presentation

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Title: Chapter 7 and 8 Review

1
Chapter 7 and 8 Review
• Electricity and Magnetism

2
• What type of circuit is represented in the
following diagram?
• a. parallel circuit
• b. open circuit
• c. series circuit
• d. electron circuit

3
Parallel Circuit
• Parallel Circuit- 2 or MORE paths

4
Series Circuit
Series Circuit- ONE path
5
• Which type of electricity is demonstrated in the
picture on the right?
• a. static electricity
• b. current electricity
• c. circuit electricity
• d. current circuit

6
Static Electricity
• Static Electricity- the accumulation of excess
electric charges on an object. Transfer of
electrons!

7
• Any substance that can attract iron or other
magnetic materials is called a/an
• a. conductor
• b. insulator
• c. magnet
• d. electron

8
• The current that flows in an electric circuit
carries ____.
• a. chemical energy
• b. mechanical energy
• c. thermal energy
• d.electrical energy

9
• A transformer that increases voltage is a ____.
• a. resistance transformer
• b. step-up transformer
• c. step-down transformer
• d. voltage motor

10
• 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

11
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!
12
• A dry-cell battery produces ____.
• an alternating current
• the same current that a generator produces
• a direct current
• both direct and alternating current

13
Direct Current (DC)- electrons move from the
negative terminal to the positive terminal. ONE
direction!
14
Alternating Current (AC)- electrons change
direction at regular intervals in a circuit.
(Alternating direction)
15
• 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

16
The magnetic force is STRONGEST at the poles.
North Pole
South Pole
17
1.5 V
2.0 ohms
0.75 amps
18
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?
19
• 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?
• protons
• neutrons
• electrons

20
Remember.
• Electricity is the flow or movement of ELECTRONS
from one place to another.

e
e
e
e
e
e
e
21
• Which items are considered to be safety devices
that stop the flow of current during an overload?
• batteries and fuses
• batteries and circuit breakers
• bulbs and circuit breakers
• fuses and circuit breakers

22
Fuse Circuit Breaker Prevents electrical
circuits from overheating
23
• The strength of a magnetic force in an
electromagnet is ________ by increasing the
current through the coil.
• unaffected
• increased
• decreased
• eliminated

24
• The strength of an electromagnet can be INCREASED
by
• Increasing the current
• More turns in coil of wire
• Bigger iron core

25
25. Which pair of magnets would result from
cutting this magnet in half?
26
• What is the voltage (VOLTS- V) of a circuit that
contains 3A of current and a 4-ohm bulb?
• 12 V
• b. 1.33 V
• c. 0.75 V

12 V
4 Ohms
3 A
27
• The voltage of the circuit is 10V. What current
flows through a 5-watt resistor?
• 50A
• 0.5A
• c. 2A

5 W
10 V
0.5 A
28
• LETS DO IT AGAIN !!!!!!!