Electrochemical Reactions. Anode: Electrons are lost due to oxidation. (negative electrode) Cathode: Electrons are gained due to reduction. (positive.

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Presentation transcript:

Electrochemical Reactions

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. Separator: Keeps electrodes from touching. (cloth or paper) Collectors/electrodes: collects current to be used in the outside circuit.

Cu Zn SO 4 -2 Cu +2 Zn +2 Cu +2 Zn +2 e- e- Zn +2 e- e- Loss of electrons OXIDATION Gain of electrons REDUCTION

 MA MA

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All 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!

A 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.

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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.

 ndscreen&v=iRnZNq_6ijI ndscreen&v=iRnZNq_6ijI  NJhv8&feature=endscreen NJhv8&feature=endscreen  &NR=1&feature=endscreen &NR=1&feature=endscreen  NR=1&feature=endscreen NR=1&feature=endscreen  pahqk&feature=endscreen pahqk&feature=endscreen

 c&feature=related c&feature=related  Ps&feature=relmfu Ps&feature=relmfu

 Electrical current that flows only in one direction (D.C.)  Electrical current that flows in one direction then the opposite direction (A.C.)

I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

VV  The electrical pressure or force  Sometimes referred to as electric potential  The difference in electrical potential energy between two points  Measured in volts

 The work performed by an electrical current  Units: Watts  The power of a Direct Current is its voltage times its current  Power is also equivalent to energy per unit time and also work per unit time P=Vx I or P= energy/time or P =work/time *energy would = P * t and units are Watthr or kWhr

R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

 V = I x R