Electricity Chapter 11
Card Set Information
Electricity Chapter 11
Electricity Glossary Terms
A closed path which electrons that are powered by energy can flow.
A source of energy that generates an electric current by chemical reactions involving two different metals or metal compounds separated by a solution that is a conductor.
A connection of two or more cells.
One of the two metal terminals on a cell or battery
The breakdown of an electrode is one factor that can limit the life of a cell
A solution or paste that conducts charge.
A cell that contains an electrolyte which is a paste.
A cell that contains a liquid electrolyte.
A cell that can only be used once.
A cell that can be recharged.
A cell that can generate electricity through the reactions of fuel stored outside of the cell
Hydrogen fuel cells combine hydrogen that is stored in a tank or cartridge with oxygen from the air
By-products are heat and water
A cell that converts sunlight into electrical light.
A position on a cell that must be connected to other components to form a circuit.
Conductor that can complete or break a circuit
Electrons cannot flow through any circuit with a gap or break (switches create these gaps).
The rate of movement of an electric charge
In a circuit it is due to the flow of electrons
The unit of electric charge
1 C = 6.25 x 10
The unit of electric current
1.0 A means that 1.0 C of charge pass a given point in a circuit every second
Free electrons in a solid move when an electric field is produced by a cell
Collisions (with ions or other electrons) interfere with the flow of electrons
It is a property of a substance that hiders electric currents and converts electrical energy into other forms
Metals have lower resistances and that is why they are used as wires to make circuit conductors
A device used in an electrical circuit to decrease the current through a component by a specific amount.
A resistor or any other device that transforms electrical energy into heat, sound, light or motion.
Potential Difference (Voltage)
The voltage of a cell is related to the amount of work that is done on each coulomb of charge that moves between the terminals of the cell
V = J/C
The unit for potential difference
Equal to 1 J/C
Electrons move from the negative terminal through the circuit to the positive terminal
A voltmeter is used to measure potential difference
Electrical charge does not lose energy as it moves along a perfect conductor with no resistance
A diagram that sues standard symbols (refer to notes) to represent components in an electric circuit
You must include
: the direction the electrons travel, the positive and negative terminals, voltage
A circuit in which there is one path for the electrons to flow through.
A circuit in which there are multiple paths for the electrons to flow through.
The ratio of potential difference (V) to current (I) is a constant called resistance (R)
Can be rearranged to find current (I=V/R)
Can be rearranged to find resistance (R=V/I)
Larger resistance=smaller current
Unit for resistance is an Ohm
The unit for resistance
Refer to image in previous question
A material in which electric charge can flow with no resistance.
Something that does not follow Ohm's Law
Loads in Series (LS)
Refer to: LS Current, LS Potential Difference, LS Resistance, Decreased Current=Decreased Glow.
Loads in Parallel (LP)
Refer to: LP Current, LP Potential Difference, LP Resistance, Bulbs in Parallel.
The same at al points because there is only one path for the charge to flow
LS Potential Difference
The potential difference splits up because the energy has to be shared by all the loads but the sum is equal to what the power supply can provide
If all loads are identical, potential difference will be shared equally; if unidentical more energy will go to the load with more resistance
Adding more loads in a series is similar to adding more length to the wire
More loads=more resistance
Total resistance is equal to the sum of resistance in each load
Decreased Current=Decreased Glow
As more bulbs are added in series, each bulb will glow less because resistance will increase causing the current to decrease
If the bulbs are identical they will glow the same
If one bulb goes out, they all go out
The current will split up because there is more than one path for the electric charge to flow
If all loads are identical the current will split up equally;if unidentical then the current will travel down the path with less resistance
LP Potential Difference
The potential difference is the same down each path on a parallel circuit because the electrons follow different paths but they only have to pass on energy to one load/path (at our level)
Adding more loads in a parallel circuit is similar to having two straw to drink out of instead of one; more paths=less resistance
Total resistance is less than the resistance down each path
Bulbs in Parallel
As identical bulbs are added in parallel the brightness of the bulbs remains the same because each path receives the same amount of energy
One goes out, all stay on