# Science Chapter 2 Electricity

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1. Charges that are the same ________ each other.

a.  repel
b.  attract
Repel
2. Charges that are different _______ each other

a.  repel
b.  attract
attract
3. the attraction or repulsion between electric charges
electric force
4. The region around a charged object where the object's electric force interacts with other charged objects
electric field
5. A build up of charges on an object
static electricity
6. In ______ electricity, charges build up on an object, but they do not flow continuously.
static
7. Rubbing two objects together may produce a buildup of ________?
static electricity
8. The law that states that charges are neither created nor destroyed but only transferred from one material to another
Conservation of Charge
9. List the 3 methods by which charges can be transferred to build up static electricity:
• 1.  charging by friction
• 2.  by conduction
• 3.  by induction
10. A method of charging an object by rubbing it against another object; the force that one object exerts on another when two rub against each other.
Friction
11. A method of charging when the transfer of electrons from a charged object to another object by direct contact.
Conduction
12. A method of charging where the movement of electrons to one part of an object that is caused by the electric field of a second object, without direct contact
Induction
13. When a negatively charged object and a positively charged object are brought together, electrons transfer until both objects have the ________ charge?

a.  same
b.  opposite
a.  same
14. A device that can be used to detect the presence of a charge, but it does not tell you whether the charge is positive or negative .
electroscope
15. The loss of static electricity as electric charges transfer from one object to another is called??
static discharge
16. The continuous flow of electric charges through a material
Electric current
17. To produce electric current, charges must flow ___________ from one place to another.
continuously
18. A complete, unbroken path through which electric charges can flow.
Electric circuit
19. A conductor  _________ transfer electric charge well.

a.  does
b.  does not
does
20. An insulator ________ transfer electric charge well.

a.  does
b.  does not
b.  does not
21. A material through which charges can easily flow.
conductor
22. A material through which charges cannot easily flow.
insulator
23. The difference in electrical potential energy between two places in a circuit.
voltage
24. __________ causes a current in an electric circuit.
Voltage
25. A device that creates an electrical potential energy different in an electric circuit, batteries and generators are voltage
voltage source
26. The measurement of how difficult it is for charges to flow through a material.
Resistance
27. The _______ the resistance, the less current there is for a given voltage.
greater
28. The energy stored in chemical compounds
Chemical energy
29. A process in which substances charged into new substances with different properties.
chemical reaction
30. Volta built the first electric battery by layering zinc, paper soaked in salt water and ______
silver
31. A device that transforms chemical energy into electrical energy.
electrochemical cell
32. A metal part of an electrochemical cell which gains or loses electrons
electrodes
33. A liquid or paste that conducts electric current.
electrolyte
34. A convenient attachment point used to connect a cell or battery to a circuit
terminal
35. ____________ occur between the electrolyte and the electrodes in an electrochemical cell.
Chemical reactions
36. A combination of two or more electrochemical cells in a series
battery
37. An electrochemical cell in which the electrolyte is a liquid.
wet cell
38. An electrochemical cell in which the electrolyte is a paste.
dry cell
39. What law states that resistance is equal to voltage divided by current.
Ohm's Law
40. Voltage   x  _________  = Resistance
current
41. What are the 3 features of a circuit
• 1.  have devices that are run by electrical energy.
• 2.  has a source of electric energy
• 3.  are connected by conducting wires
42. An electric circuit with a single path.
series circuit
43. What would happen if one light in a series circuit burns out.
It would be a break in the circuit and all of the lights would go out as well.
44. A device used to measure current.
Ammeter
45. An electric circuit with multiple paths
parallel circuit
46. In a _____ circuit there is only one path for the current to take.
series
47. In a __________ circuit, there are several paths for current to take.
parallel
48. What happens if a light burns out in a parallel circuit?
If there is a break in one branch, charges still move through the other branches, so the others will remain lit.
49. A device used to measure voltage or electrical potential energy difference.
Voltmeter
50. Would the circuits in your home be series or parallel?
They would be parallel.  If they were series, when one light goes out all of them would go out in the house.
51. The rate at which energy is transformed from one form to another is known as _____?
power
52. The unit of power is ______?
Watt (W)
53. What is the calculation to find power?
Power = voltage  x  current
54. The total amount of energy used by an appliance is equal to the power of the appliance multiplied by the amount of time the appliance is used.
energy =  power  x  time
55. A connection that allows current to take the path of least resistance is called?
Short circuit
56. One way to protect people from electric shock and other electrical danger is to provide an alternative path for electrical ________.
current.
57. The __________, which is round, connect any metal pieces of the appliance to the ground wire of the building .
third prong
58. In order to prevent circuits from overheating, devices called ______ and ________ are added to circuits.
fuses and circuit breakers
59. A reusable safety switch that breaks the circuit when the current gets too high.
circuit breaker

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 Author: sjbasls ID: 308978 Filename: Science Chapter 2 Electricity Updated: 2015-10-04 18:25:26 Tags: ASLS Electricity Folders: Science electricity ASLS Description: ASLS Science test chapter 2 Show Answers:

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