Physics #2, Chapter 15

Front 1

Coulomb

Back 1

*a unit of charge
*name is from Charles Augastin de Coulomb, French Physicist.

Front 2

2 types of Charge

Back 2

1. positive
2. negative
*electrical charges can attract or repel each other.
*all masses attract each other through gravity.

Front 3

Electrically Neutral

Back 3

*an object with a net charge of zero
examples: pencil, textbook, and your body.

Front 4

Charged objects

Back 4

*when its net charge is not zero
*sometimes called "excess" charge because a charged object has an excess of either positive or negative

Front 5

What causes shocks

Back 5

*you get a shock because excess of charge on one sign strongly attracts charge of the other sign and repels charge of the same sign.
*when you walk across a carpet on a dry day, your body picks up excess negative charge.

Front 6

Coulombs Law

Back 6

*the force between charges is very strong.
*more charge means more force.
*less distance means more force
*explains the relationship between the amount of each charge (q1 & q2) the distance between their centers (r) and the electrical force (fe)

Front 7

Electrostatics

Back 7

*part of physics that deals with the force created by unmoving charges.

Front 8

"AMP"

Back 8

*a short way of saying coulomb per second.
*1 coulomb of charge passes by a point in the wire in 1 second.

Front 9

Electron Motion

Back 9

*valence electrons are in motion in copper(metal) and have no direction.

Front 10

Drift veloctiy

Back 10

*when a battery is connected to the ends of the copper wire the electrons are attracted to the positive side.
*they are NOT in a straight line.

Front 11

Super-Conductors

Back 11

*carries electrical current with 0 resistance.

Front 12

Capacitor

Back 12

*stores energy by keeping positive and negative charges seperated.
*Both plates start out neutral.

Front 13

Using a Capacitor's stored energy

Back 13

*once a capacitor is charged it has a voltage and can drive current in a circuit.
*releases quickly and in large amounts.
*releases quickly and in large amounts

Front 14

Charging a capacitor

Back 14

*one plate is positive and the opposite plate has an equal negative charge.
*together the plates have a net charge of 0

Front 15

Battery

Back 15

*transforms chemical energy to electrical energy

Front 16

Volt

Back 16

* 1 volt is 1 joule per coulomb

*joule/coulomb

Front 17

Electroscope

Back 17

*forces between charges can be observed with an electroscope

Front 18

Static electricity

Back 18

*an imbalance in either positive or negative charge on an object.