Chapter 7 and 8 Review - PowerPoint PPT Presentation

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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 !!!!!!!
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