Shared Flashcard Set

Details

Chapters 22 and 23
Electricity
49
Physics
12th Grade
03/24/2013

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Cards

Term
What is an electric current? What are the two types of current?
Definition
the flow of charge; AC and DC
Term
What does AC mean? HOw does it move?
Definition
alternating current; moves back and forth
Term
What does DC mean? HOw does it move?
Definition
direct current; moves in the same direction
Term
What is the unit for current? What is the symbol for current?
Definition
Amp (A); I
Term
What is electric potential?
Definition
the difference in potential energy between two points
Term
What are other names for electric potential?
Definition
potential difference, potential drop, EMF, voltage
Term
What is the unit for electric potential?
Definition
volt
Term
What are fives sources of electric potential?
Definition
electromagnetic induction, photoelectric effect, thermoelectric, piezoelectric, chemical effect
Term
What type of energy is converted in electromagnetic induction? What is an example of something that uses electromagnetic induction?
Definition
mechanical energy converted to electrical energy; example is a generator
Term
What type of energy conversion takes place in the photoelectric effect?
Definition
light energy to electricity
Term
What type of energy conversion takes place in the thermoelectric effect?
Definition
heat is converted to electricity
Term
What type of energy conversion takes place in the piezoelectirc effect?
Definition
mechanical energy to electricity
Term
What type of energy conversion takes place in the chemical effect?
Definition
chemical energy to electric
Term
What is an example of the piezoelectric effect?
Definition
gas grill starter
Term
practice voltage and current drawings (batteries)
Definition
Term
What is resistance?
Definition
loss of energy or opposition to current
Term
What are four factors that affect the resistance?
Definition
length, area, resitivity, temperature
Term
What is the unit for resistance?
Definition
ohms
Term
How does the length of the wire affect the resistance?
Definition
the longer the wire, the more resistance
Term
How does area affect resistance?
Definition
the more area, the less resistance
Term
How does the resitivity affect resistance?
Definition
the lower the resitivity, the better conductor
Term
HOw does temperature affect resistance?
Definition
as temperature increases, resistance also increases
Term
What is the equation to calculate the resistance of a piece of wire?
Definition

R=pl/A

A=pir squared

Term
How do you read the resistance of a resistor?
Definition
look at the colors--do not add the numbers, just put them together and multiply by the third number
Term
What is Ohm's law?
Definition
I=V/R or V=IR
Term
The smaller the wire the, ____resistance.
Definition
more
Term
What are three things you must have for a circuit?
Definition
source of voltage (EMF), conductors to complete the pathway, load
Term
What is a load?
Definition
something that is being run by the circuit
Term
study circuit symbols
Definition
Term
How do you calculate electrical power?
Definition
P=w/t=VI=I2R=V2/R
Term
How do you calculate electrical energy?
Definition
energy = power x time
Term
What is a kilowatt hour?
Definition
a unit of energy equal to the work done by a power of 1000 watts operating for one hour
Term
How do you calculate cost?
Definition
cost = energy x rate (energy is in kilowatt hours)
Term
Which way do electrons flow in conductors?
Definition
from negative to positive
Term
Which way does conventional current flow?
Definition
positive to negative
Term
One coulomb is equal to how many electrons?
Definition
6.25 x1018 electrons
Term
sample problem one on review sheet
Definition
Term
If electrons are moving north, in which direction is the current moving?
Definition
moving south
Term
What is drift velocity?
Definition
the speed of the electrons (very slow)
Term
What is EMF?
Definition
electromagnetic force
Term
What is the symbol for a cell?
Definition
short line is a cathode (-); long line is an anode (+)
Term
When cells are connected in a series, what increases?
Definition
voltage
Term
When cells are connected in parallel, what increases?
Definition
current
Term
What is resitivity? What is the symbol?
Definition
measure of the resistance per length; symbol is p (rho)
Term
The number of charges passing a point in a second is called the _____
Definition
electric current
Term
What causes charge to flow?
Definition
voltage or potential difference
Term
If the length of wire increases what happens to the resistance?
Definition
it increases
Term
IF the width of the wire increases, what happens to the resistance?
Definition
it decreases
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