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Monday January 23, 2012
Classwork: #17 Simple Mach Quiz#18 Quiz Corrections
#19 Intro to Electricity Lecture Notes
#20 Vocab practice
Homework:#20 Vocab Practice\
#18 Quiz Corrections
Warm Up
Electrons have a
a.Positive charge and protons have a negative chargeb.Negative charge and protons have a positive chargec.Neutral charged.Negative charge and protons have a neutral charge
How does an atom become electrically charged?
When an atom gains or loses an electron
What is Electricity? Like charges repel and opposite charges attract
• Electric Charge – like charges repel and unlike charges attract– Created through loosing or gaining electrons– An atom that gains an electron is negatively
charges – An atom that looses an electron is positively
charged
How do you create a charge?• Atoms are typically neutral charge,
but they can become charged in 3 ways– Friction – electrons are wiped from
one object to another through rubbing surfaces
– Conduction – electrons move from 1 object to another through direct contact
– Induction - charges in uncharged metal are rearranged without touching
Conservation of Electric Charges – electrons are not lost or created , they just move from 1 atom to another
Moving Charges• Electrical Conductors – material where
charges move easily• Electrical insulator – material where charges
cannot move easily• Static electricity – charges at rest on an
object • Electric discharge – loss of static electricity as
charges move off an object• Lightening is an example of moving charges
Lightening is an example of attracting electrical charges
#20 Vocab Practice
Tuesday January 24, 2012
Classwork:#21 Current Notes
#22 Intro to Electricity Review
Homework: Complete # 22
Warm Up
Which of the following statements is correct?
a.Like charges attract and unlike charges repelb.Unlike charges attract and like charges repelc.Unlike and like charges attractd.Unlike and like charges repel
• Electrical current – the rate that charges pass a given point• When you turn on a switch you command electrons to
move forward instantly• Measured in amperes or AMPS
• There are 2 kinds of current: AC & DC• AC -alternating current, electrons can move in both
directions• EX: your house electricity
• DC – direct current, electrons travel in same direction only• EX: batteries
• Electrons want to move forward because of voltage – the amount of energy required to move electrons forward• More voltage = higher current
• Resistance – opposition to current flowing • Insulators have high resistance
Wednesday January 25, 2012
Classwork:
#23 Circuit Prediction Guide
#24 Magic School Bus Gets Charged
Warm Up
Which of the following materials serve as an insulator?
a.Copperb.Ironc.Aluminumd.rubber
#23 Prediction GuideDivide you paper in half
Prediction Before Video After Video
Draw what you think a circuit looks like
What do you think the main parts of a circuit are?
Why do you think light switches are important?
#24 Magic School BUS Gets Charged
#23 Prediction GuideFill in the other side of your prediction
guide!Prediction Before Video After Video
Draw what you think a circuit looks like
What do you think the main parts of a circuit are?
Why do you think light switches are important?
Thursday January 2, 2012
Classwork:
#25 READ & Section Review pg 499 #1-5 & 7
Warm Up
In which type of current to charged particles flow in only one direction?
a.ACb.DCc.Voltaged.Amperes
Friday January 27, 2012
Classwork:
#27 Circuit Notes#28 Circuit Practice
Homework: None
Warm Up
Which of the following describes the method of creating a charge by wiping electrons from one object onto another?
a.Conductionb.Convectionc.Inductiond.Friction
#27 Circuit Notes •Electric circuits – complete closed path through which electric charges flow•All circuits have 3 basic parts – load, energy source & wires– Load – radio, fan, transforms electrical energy into
another energy– Energy source – outlets, batteries– Also have switch – used to open or close circuit
• Series circuit – all parts are connected in a single loop
• Only 1 path for electricity to flow
• Adding more bulbs will reduce the brightness of each bulb
• If any lightbulb goes out or turns off none of the others would work
• Parallel circuit – loads are connected side by side
• Electricity branches off to each bulb – Keeps brightness the same
no matter how many bulbs• Benefit – that each load can
work individually of others
Circuit Safety
• If wires get frayed It can cause the resistance to increase, and the circuit can heat up and fail
• If a circuit has too many loads it can also overheat (possible fire!)
• Fuses & circuit breakers have thin metal strips that melt and break the circuit if over heated
1. Describe some disadvantages to using a series circuit.
2. Draw a series circuit with 3 different loads on it.
3. Will the series circuit that you drew work well? Why or Why Not?
4. Draw a parallel circuit with the same 3 loads in it.
5. Why would the parallel circuit you drew work better than the series circuit