power cells and batteries
DESCRIPTION
Electrochemical Reactions. Power Cells and Batteries. Parts. Anode: Electrons are lost due to oxidation. (negative electrode) Cathode: Electrons are gained due to reduction. (positive electrode) Electrolyte: The medium that carries the ions or electric charges. - PowerPoint PPT PresentationTRANSCRIPT
POWER CELLS AND BATTERIESElectrochemical Reactions
PARTSAnode: Electrons are lost due to
oxidation. (negative electrode)Cathode: Electrons are gained due to
reduction. (positive electrode)Electrolyte: The medium that carries
the ions or electric charges. Separator: Keeps electrodes from
touching. (cloth or paper)Collectors/electrodes: collects
current to be used in the outside circuit.
ELECTROCHEMICAL REACTION
Cu Zn
SO4 -2
SO4 -2
SO4 -2
SO4 -2
Cu+2
Zn+2
Cu+2 Zn+2
e- e- Zn+2
e- e-
Loss of electronsOXIDATION
Gain of electronsREDUCTION
ELECTROCHEMICAL CELL http://
www.youtube.com/watch?v=0oSqPDD2rMA
SIMPLIFIED BATTERY http://
www.magnet.fsu.edu/education/tutorials/java/daniellcell/index.html
VOLTAIC PILE http://
www.youtube.com/watch?v=edMN7P5oCaY
POWER CELLAll of the “batteries” pictured are really just single POWER CELLS.
They have only one cathode and one anode.
All of these power cells have a voltage of 1.5 regardless of size!
BATTERYA true BATTERY is actually several power cells connected together.A 9-volt battery is six 1.5V power cells connected to each other.A car battery is a combination of enough power cells to equal 12 volts.
HOW DOES A CAR BATTERY WORK? http://
www.youtube.com/watch?v=4IgHj2Uim_0&feature=related
USING POWER CELL TO MAKE A BATTERY
Most electronic devices run on a combination of
power cells. This combination can increase the life of the battery or
increase the voltage supplied
to the circuit.
TIME FOR YOU TO MAKE A BATTERY
ELECTRICITY TERMS
TESLA – LET’S TALK ABOUT ELECTRICITY AND CURRENT
http://www.youtube.com/watch?NR=1&feature=endscreen&v=iRnZNq_6ijI
http://www.youtube.com/watch?NR=1&v=sDTUEBNJhv8&feature=endscreen
http://www.youtube.com/watch?v=aaAHq1yh1vk&NR=1&feature=endscreen
http://www.youtube.com/watch?v=iubyEuNbyjw&NR=1&feature=endscreen
http://www.youtube.com/watch?NR=1&v=y2RQttpahqk&feature=endscreen
ELECTRICITY HOW OUR GRANDPARENTS LEARNED IT
http://www.youtube.com/watch?v=IpaEGhjpZgc&feature=related
http://www.youtube.com/watch?v=nZjMARe6APs&feature=relmfu
DIRECT CURRENT VS. ALTERNATING CURRENT
Electrical current that flows only in one direction
Electrical current that flows in one direction then the opposite direction.
CURRENT I Quantity of electrons that pass a given
point in a given time Ampere 1 ampere is
6,250,000,000,000,000,000 electrons passing a point in 1 second
1 amp = 1,000 mA
VOLTAGE V The electrical pressure or force Sometimes referred to as electric
potential The difference in electrical potential
energy between two points Measured in volts
POWER The work performed by an electrical
current Watt The power of a Direct Current is its
voltage times its current
RESISTANCE R The degree to which a conductor
hinders the charge flow Ohm A potential difference of 1 V will force a
current of 1 amp through a resistance of 1 ohm
OHM’S LAW V = I x R