1. Quick Question:
Complete the review worksheet at your table. When you have the correct answers, turn it in.

2. Objective: I understand the how electricity moves through a circuit.

3. Electrical Power:
Amount of work electricity can do
Watts

4. V= 120 Volts I = 2.2 Amps P = ? P = VI P =120 * 2.2 P = 264 Watts
Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
V= 120 Volts
I = 2.2 Amps
P = ?
P = VI
P =120 * 2.2
P = 264 Watts

5. 18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
18) Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?

6. Direct Current:
Only flows in 1 direction
Example: batteries

7. Alternating Current:
Flow regularly reverses direction
Example: Household currents

8. AC/DC ????

9. Circuit Diagrams:
Show the flow of electricity

10. Wire & Power Source (battery)
Draw A Simple Circuit:
Wire & Power Source (battery)

11. Add Switch:

12. Add Resistance:

13. Add Light Bulb

14. Series Circuit: 1 Path
One element doesn’t work, nothing works. The current stops.

15. Create A Series circuit with a switch, a battery, and 2 light bulbs.

16. Parallel Circuit:
More than 1 path
One element doesn’t work, the current goes around it.

17. Create A Parallel Circuit with a battery, 2 light bulbs, and NO switch.

18. Create A Parallel Circuit with 3 bulbs, a switch and 2 connected batteries.

19. Create A Series Circuit with 3 lights, a battery and a switch
Create A Series Circuit with 3 lights, a battery and a switch. Label the lamps A, B, & C.

20. An Electric Highway

21. Making an Electromagnet
Run Current
Through A wire

22. Making an Electromagnet The current creates a magnetic field

23. Making an Electromagnet
Inserting metal rod or more coils increase strength of field

24. mechanical energy into electricity
Generators:
Change
mechanical energy into electricity

25. Change Electricity into
Motors:
Change Electricity into
Mechanical energy

26. Generators
& Motors

27. Making an Electromagnet Can be created using a battery, wire, & nail

28. Check yourself:
Go to:
Socrative.com
Choose Student login.
Enter your true name.

29. Whiteboard Practice

30. What is an Electric Charge? An excess of positive or negative charges

31. What type of circuit is diagramed below?
Parallel Circuit

32. Draw the symbol for resistance used in an
electrical diagram.

33. Find the current of this circuit.
V = 24
I = ?
R = 6
R = 6
V = 24
volts
V = IR
24 = I * 6
4 amp= I
Find the current of this circuit.

34. What type of circuit does this electrical diagram describe?
Series circuit.

35. What determines the potential difference in an electric field?
The change in electrical charge from one position to another

36. Find the voltage of this circuit.
I = 2 amp
R = 10
V = IR
V = 2 * 10
V = 20 volts 10
2 amp
Find the voltage of this circuit.

37. What kind of electrical current flows only in one direction?
Direct Current

38. What would happen if light bulb 3 burned out?1
What would happen if light bulb 3 burned out? 2 3

39. What is the transfer of charges without touching called?
Induction

40. V = 120 Volts P = 102 Watts I = ? P = VI 102 = 120 * I I = 0.85 Amps
Harley’s television is connected to a 120-volt line. It uses 102 watts of power. How much current flows through it?
V = 120 Volts
P = 102 Watts
I = ?
P = VI
102 = 120 * I
I = 0.85 Amps

41. What would happen if light bulb 3 burned out?1 2 3
What would happen if light bulb 3 burned out?

42. How does a circuit breaker prevent electrical fires?
A switch flips so the circuit can’t be completed

43. Back to the Future?
Hyperlink picture to Back to Future clip

44. Today’s Objective:
I understand changes in an atom’s nucleus that release energy.

45. Atoms of the same element can have different number of neutrons
Atoms of the same element can have different number of neutrons. What are these called?
Radioactive: Unstable isotopes because they have too many neutrons in them.

46. All elements with atomic numbers greater than 83 are radioactive.

47. * Because their nucleus is unstable, they try to get rid of the things causing it to be unstable.
Alpha particles: a helium atom with 2 neutrons
Makes atomic number of parent atom two less
Can’t pass through paper;
Most dangerous in body

48. Negative charge… Part of neutron
Beta particles: emitted by an unstable atom
Will penetrate objects but are stopped by wood or thick plastic
Negative charge…
Part of neutron

49. high energy x-ray waves
Gamma Particle:
high energy x-ray waves
Only stopped by very thick lead

50. .

51. Radioactive Decay: Process where atoms give off alpha particles, beta particles, or gamma rays
Becomes a different element

52. Half-life: The length of time it takes ½ of the atoms in a radioactive sample to decay and become a different element.

56. Thallium-208 has a
half-life of min. What fraction of a sample of Thallium-208 will be radioactive after 2 half-lives?

57. Thallium-208 has a half-life of 3. 053 min
Thallium-208 has a half-life of min. After 10 minutes, how much of a 25 gram sample of Thallium-208 will be radioactive?

58. Thallium-208 has a half-life of 3. 053 min
Thallium-208 has a half-life of min. How long will it take for g to decay to 7.50 g?

59. Balancing Nuclear Equations:
Even with nuclear reactions, mass must be accounted for.

60. Nuclear Notation for
alpha particle: 4 2
Mass Number He
Atomic Number

61. A balance a nuclear equation for alpha decay of polonium-210.
1) List info given: Po-210
2) Write parent isotope using
nuclear notation: Po 84

62. 3) List unknowns:
Z = Atomic # of daughter
A = Mass # of daughter
X = Chemical symbol of daughter

63. 4) Write the equation containing the information.
Po X + + Z
5) Write and solve the equation for mass.
210 = A + 4
210 – 4 = A
206 = A

64. 6) Write and solve the equation for atomic number.
84 = Z + 2
84-2 = Z
82 = Z
7) Use the periodic table to determine the element with an atomic number of is lead so X is Pb.

65. 8) Write the balanced nuclear equation:
Po  Pb + He
9) Check your work.
The mass number on the left equals the sum of the mass numbers on the right.
The atomic number on the left equals the sum of the atomic numbers on the right.

66. Assignment: Page 295
Math Practice 1-4
Turn in before you leave today.