Card Set Information
what is electricity
is the movement of electrons through something( medium)
What are the 2 reasons why electrons move
1. they are attracted to protons
2. they are hit by another electron and bounce out of the way
What is electricity similar to
water moving in a hose
What is a circuit
a complete pathway for electrons to travel
What happens in a complete circuit
electrons must be able to move back to their starting point
What 3 main parts do circuits have
1. source of power/electrons ex:battery
2. medium for electrons to travel ex
: wire and other conductors
3. something for electrons to do work on ex
: light bulb
designed to slow down the flow of electrons
What material is resistor made of
made of material that isn't quite considered to be a conductor, but isn't an insulator either
Different materials allow circuits to have ______ resistances
What does a switch allow you to do
allows you to disconnect the circuit when you want electrons to stop flowing and reconnect when you want electrons to resume flowing
define closed circuit
circuit is complete and electricity can travel thru it
define open circuit
circuit is incomplete and electricity cannot travel thru it. Usually, this occurs when you move a switch to the off position
define series circuit
all the objects that work is done are in a straight path
How you you travel in a series circuit
you can travel from one object to the next only one way. Are no options
Define parallel circuits
objects that work is done on are not in a straight path
How do you travel in a parallel circuit
you have options to how you can travel from one object to the next
what is an electrical current
electrons in motion
what are the 2 main types of currents
Alternating and direct
Alternating electrons constantly ________ like in an ____
change directions, outlet
Direct electrons move _________ like in a ______
only in one direction, like in a battery
How is current measured
is measured in terms of the rate at which electrons travel through a circuit
What unit is current symbolized in?
Amperes or Amps (A)
What is the tool used to measure current
What is voltage?
is the measure of the amount of force (pressure) that keeps the electrons flowing across circuit
where electrons go through
Define AC and an example
electrons constantly change directions. Ex: outlet
Define DC and an example
electrons move only in one direction. EX: battery
What is the two reasons why electrons move.
1. Are attracted to protons.
2. They are hit by another electron and bounce out of the way.
is a quantity that measures the rate at which work is done
rate at which electrons travel through a circuit
how much the flow (current) is restricted by the material (resistor)
What causes resistance
What two relationships are described in Ohm's Law? What's the equation.
Current is directly related to volts and inversely related to resistance.
If the distance between two objects is cut in half and the charges remain the same, how much will electrical force between them change?
If the charges of only one object doubles, how much will the force between them change?
When a circuit is complete, it is called a
A unit to tell you the amount of charge in an object
Rate at which electrical work is done
When does circuits become overloaded
when the resistance is too low
Complete pathway for electrons to travel.
Caused by pressure differences across a resistor
Amount the current decreases when electrons pass through a resistor
The force between two objects is ____ related to the square of the distance between the objects
In the coloumbs law , what does q1 and q2 represent
represent the charges of the two objects
Caused by improper, wiring, occurs when electrons have accidental alternate path of travel causing an overloaded circuit?
Tells is the relationship among force between two objects, charges of the objects, and distance between the objects.
You shock others because you have an excess of these particles in your body.