Download Slide 1 Magnetism - Spring Branch ISD

Name ___________________________ Per. ______ Date ________
Series/Parallel Circuits and Magnetism
Slide 1 – Types of Circuits
1. Watch the animation and answer the question: What is the difference between the wiring?
Slide 2 – Series Circuits
2. Explain why all the lights are dimmer in this circuit:
Draw a series circuit here.
3. What type of circuit is this? ______________________
Slide 3 – Pitfalls of Series Circuits
4. When the circuit is _________________; then the current ____________________.
5. Give an example of this type of circuit: _______________________ (Ho! Ho! Ho!)
Slide 4 Series Circuit Info
•
Series circuit=The current has ________ ______
__________ it can travel along
•
One light goes out _____ ___________ ________-open circuit
•
Imagine if you turned off one light in your house that means that the circuit is broke and
__________________ else goes off. Everything would have to be turned on to keep things
running.
•
Current is the ____________ at all points
•
Voltage is ____________ by each ______________ (light bulb, motor, heaters)
•
_____________ ________-each separate resistor causes volts to drop
Slide 5 Kirchhoff’s Voltage Law


The total of all voltage ____________ must add up to the total voltage ___________ by the
battery (energy in)
+1.5 V - 0.5V - 0.5 V - 0.5 V = 0
battery bulb
bulb
bulb
Slide 6 – Parallel Circuits
Draw a parallel circuit here.
6. Parallel Circuit= a __________________ circuit
the current has more than one ______________.
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Slide 7 – Advantages of Parallel Circuits
7. When one light bulb _________________ the others still ____________________.
8. Give an example of this type of circuit: ___________________________________
Slide 8 Parallel Circuit Info

contains_________________ branches for current to move through

potential difference (volts) _____________ at each branch

one light off, use other branches to transfer current

voltage is the ____________ across all branch points (think of them as separate series
circuits connected to a battery)

each branch ______ ________ always have the same current, depends on how much
________________ is in each branch, (desk lamp, power saw)
Slide 9 Kirchoff’s Current Law
9. If current flows into a branching point, the ________ _________ _________ must flow out
again.
Magnetism Note Guide
Slide 10 Magnetism
1. Property of matter in which there is a force of ____________ or
______________ between ___________ or _________ poles.
Slide 11 Magnetic Materials
2. __________________ magnet
a. Material that ____________ its magnetic properties, even when it is not close to
other magnets
b. _________________ = natural magnetic rock (________________)
c. Ex. bar magnet, refrigerator magnet, horseshoe magnet
3. ___________________ magnet
a. Easy to magnetize, ___________ to __________ magnetism
b. nickel, cobalt, iron, eg. Al,Ni,Co (alloy)
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Slide 12 Common Properties of Magnets
4. Two opposite poles called ___________ and ____________
5. If divided, there will always be a north and south pole
6. When near each other, magnets exert ___________ __________ on each other
7. _______________ POLES ____________; _________ POLES _____
Slide 13-14 Magnetic Domains
8. ___________-groups of atoms with ______________ magnetic poles
9. Electrons in atoms behave like small loops of current that act like tiny electromagnets with
north and south poles
10. We don’t see the magnetism because it is so small and on average the atomic magnets
cancel each other out
11. When atoms are aligned in a ____________ _________________ a permanent magnet is
produced
12. Atoms in ________, ___________, and __________ are free to move - If brought near a
permanent magnet it forces the atoms to temporarily align and therefore becomes a
temporary magnet
13. In ___________________ materials the atoms are ________ ________ to move so they
are not affected by magnets
________________________
_______________________
Slide 15 Auroras
14. _________________ & ________________lights
15. Produced by the earth’s _______________ ____________ trapping
charged particles from the sun.
16. The particles ________________ producing _____________.
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Slide 16 Losing Magnetic Properties
17. Magnets lose their magnetic properties if _______________ of the domains is
___________________
18. Alignment can be destroyed by:
1.______________ the magnet
2._______________ the magnet
Slide 17 Magnetic Fields
19. The force felt _____________________________________________________.
20. _________________ ___________ _________– represent the direction of the field
around a magnet;
a. Arrows are drawn ____________ to ___________
21. __________ of field ___________ represents the _____________ of the
magnet in that area
22. The force is the _______________ at the __________
Slide 18 Discovering Magnetism
23. 500 B.C. – people discover naturally occurring materials have magnetic properties
(________________ and _______________)
24. 500 B.C. – ___________ noticed one end of suspended lodestone pointed north and the
other pointed south, _________ application of the ____________
25. 220 B.C. – Chinese also recorded use of compass called “south pointer”
26. 1088 A.D. – ____________ made small ___________ like _______
27. 1183 A.D. – ________________ compass appears
Slide 19 Compass
28. Compass needle is a magnet _________ to _______ until it _______ _____ in the
_________ - ______________ direction
29. ___________________ North Pole of the Earth is the ______________South Pole since it
attracts the north poles of the magnet
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Slide 20-21 Do you know where the North Pole Is?
30. Does it move or is it stationary?
Slide 22 Movement of the Pole
31. During the sixteenth century, mariners believed that somewhere in
the North was a ________________ _______________
that was the source of attraction for compasses.
Slide 23 North Magnetic Pole Movement
Geological records suggest
that the Earth’s magnetic field
actually flips roughly every
200,000 years, so the North
Pole may one day become the
north-seeking pole.
Slide 24 Electromagnetism
32. Hans Christian ______________ – Danish physicist and chemist who discovered that a
current in a wire caused a compass needle to deflect
33. __________________ electric _______________ create a ________________ field
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Slide 25-26 Electromagnet
34. Magnets that are created when there is electric _____________ ____________ in a
__________
35. Simplest electromagnet uses a ________ of ___________, often _______________ around
some _____________
36. Iron core becomes a ___________
37. Magnetic field ______________ with the coil carrying ___________
38. North and south poles are located at the end of each coil
39. Which ____________ is north depends on the _____________of the electric
_______________
40. A __________ electromagnet is a ______________ between too much _______________ and
having enough _____ to get a strong magnet
41. Uses of electromagnets – ______________, ____________, toaster
Slide 27 Increasing the Strength
1) Increase ___________ of iron core
2) Increase ___________
3) Increase the _____________ of coils
Slide 28 Electromagnetic Induction
42. 1831 – Michael ______________
(UK) &
Joseph Henry(USA)
43. Process by which _____________ a wire through a magnetic field an electric ___________ is
_____________ in that wire
44. If a magnet is thrust into a coil it induces current flow
45. If the ___________ stops the ______________stops
46. The ___________ the ______________ of the magnet the ___________ current induced
47. When you pull the magnet ___________ __________ the current flows in the
________________ __________________
48. Electromagnetic induction is how we transform ______________energy into
______________energy
49. Power plants use ______________________
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Slide 29-31
50. _______________ change _______________ energy to ______________energy
51. _____________ _____________ changes _____________energy into ________________
energy
52.
________________-reversing switch in a motor that rotates with an electromagnet
(Motor or Generator…magnet, brushes, shaft, commutator, coil)
Slide 32-33
53. ___________________ : step-up (increase) or step-down (decrease) __________________
54. MRI-____________ _____________ ___________-magnetic field taking pictures of your insides
Slide 34 Electrical Measuring Instruments
55. __________________-used in parallel to measure voltage
UPWARD BOUND
PROGRAMS
GREATER
HOUSTON AREA
56. __________________-used in series to measure current
57. ______________________-use to detect a current
TEXAS
SOUTHERN:
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