Static Electricity (The Science of It)
Can JT discharge even if his finger doesn't touch the door knob?
Yes, because of the the large negative amount of electrons/ negative charge can be attracted by the positive charge of the door knob, even at 25-75 degrees away.
Opposite charges _____ each other
attract
The charge goes to JT's ___ after rubbing his foot on the carpet.
body (mostly his foot and leg)
insulator is a...
things that don't let their electrons go very easily/ they hold onto the electrons tightly
Electricity comes from the greek words ___ and ____.
1. "elektron" (amber) 2. "elektor" (beaming sun)
Charged by Friction (Explanation)
1. Rub balloon on hair* (both of which start out neutral) 2. the rubbing takes off electrons from the hair, transferring them to the balloon* (making balloon negatively charged and the hair positively charged). 4. the positive hair and the negative balloon attract (opposites charges attract) * both are used as examples
How much time does it take to get the electrons to discharge at 0 degrees? 70 degrees? What's the difference?
0: 4 seconds* 70: 11 seconds* Difference: 8 seconds* * Includes charging time
Electroscope (How is works)
1. The object being tested is brought close to the aluminium ball on the electroscope. 2. Any possible electrons repel the electrons in the aluminum ball 3. the electrons from the ball are sent down the wire into the aluminium "leaves"/ foil 4. the "leaves"/ foil repel from each other because of how they're the same charge
____ takes a while and ____ is almost instant.
1. charging 2. discharging
The three ways that charges can be transferred are ___, ____, and ____.
1. conduction 2. induction 3. friction (pressure)
Charged can't be ______ or _____, they are only ____.
1. created 2. destroyed 3. transfered
Charged by Induction (Explanation)
1. get a negatively charged balloon* (from charged by friction) 2. the balloon repels the electrons in the white board*, pushing them towards the back 3. the positive nucleus is "exposed" (Nucleus is positive because of the positive protons and the neutral nucleus create a positive charge). 4. the positive nucleus attracts the balloon and they stay together (until all electrons are transferred) * both are examples
The two types of elctrical charges are ______ (from protons) and ______ (from electrons).
1. positive 2. negative
JT discharges the electrons when the __ comes out of his __ to the ___.
1. spark 2. finger/hand 3. Door knob
__ ________ is the the biggest angle that electrons can be discharged by JT.
70 degrees
What is the sweater, balloon and wall like before the sweater experiment?
All have a neutral charge (same amount of protons and electrons)
What happens when the NEUTRAL BALLOON is rubbed against the sweater?
Balloon: gains electrons from sweater (Negatively charged/ made of anions) Sweater: Gives electrons to the balloon (positively charged/ made of cations)
What method was used to charge the balloon when it rubbed against the sweater?
Charged by friction (or pressure)
How is JT charged by friction?
He rubs his foot on the carpet (both of which start out neutral); the rubbing takes off electrons from the carpet and transfers them to his foot (making his foot negatively charged and the carpet positively charged); finally, the positive hair and the negative balloon attract (opposites charges attract). (Same as charged by friction, but balloon= foot and hair= carpet).
The method used to charge the wall was ____.
Induction (Because of how the wall wasn't rubbed on, transferring electrons to it; and how it didn't create a spark or transfer across a large gap).
What happens when the NEGATIVELY CHARGED BALLOON is released into the open space?
It goes back to the positive sweater (opposites attract)
friction (definition)
Noun: "The resistance that one surface or object encounters when moving over another" or the action of an object rubbing against another.
conduction (definition)
Noun: "the movement of something such as heat or electricity through a medium passage".
induction (definition)
Noun: the process that a body that has electric or magnetic properties, produces magnetism (an electrical charge)
What charge does the wall have with the balloon near it?
Positive, because the electrons all moved to the back of the wall and all that was left was the positively charged nucleus.
conductor is a...
things that allow electrons to flow through them easily (like metals and water)
When two balloons are charged by friction, what will happen when you try to put them in contact?
The balloon will repel from each other because of how they're both negatively charged, and "like charges repel". (They also naturally go in opposite directions because of this).
What happens when the balloon is close to, but not touching the wall?
The electrons in the wall repel because of the negatively charged balloon, exposing the positively charged nucleus, allowing the balloon and wall to attract each other. (Electrons repel to the back of the wall).
How is the door knob charged by contact?
The extra elctrons in JT flow through his finger (which is somewhat near the metal door knob), allowing the electrons to jump from his finger to the door knob.
What happens when the NEUTRAL BALLOON is rubbed against the wall?
The wall/ balloon doesn't transfer any electrons, or take any electrons from the other object.
discharge (definition)
Verb: to allow a liquid, gas, (etc.) to flow out from where it has been confined Noun: the action of discharging a liquid, gas (etc)
When a pathway for the elctrons forms suddenly and the charges move very quickly we say that the static has ______.
discharged
When JT rubs his foot on the carpet, he is transferring _______ into his body.
electrons
amber is...
fossilized tree resin (not sap!!!!)
When you rub his foot more on the carpet, the (negative) charge grows ___.
larger
Only ___ charges move.
negative
Discharge is accompanied by pain because...
of the speed in which the electrons are jumping from his finger to the door knob.
Like charges ______ each other.
repel
