Unit D: Electrical Principles. Topic 1: Transfer and Storage of Electrical Energy. I. Review. What is electricity?. Is the energy of charged particles. Is when electrons are moved. Remember: Electrons are the outer particle of an atom. I. Review.
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Topic 1: Transfer and Storage of Electrical Energy
Remember: Electrons are the outer particle of an atom
# of protons = # of electrons
A. Laws of Electrical Charge
(+ and – will attract)
To witness the action of uncharged/ charged objects on each other.
Remove charges from objects by running through your hand
Charge objects by running through paper towel or fur
(vs. current electricity where charges are flowing)
A. Charge Separation
Electric eels work to kill or stun prey by using electrical discharge of static electricity
Where have you seen these parts before?
1. What is the difference between 1.0A and 3.0A?
2. What is the difference between 1.5V and 9.0V?
3. What is the difference between 2.0 and 6.0 ?
Current – how quickly the water is flowing down the waterfall
Resistance – how many rocks are in the stream bed, preventing the flow of water
Voltage – the height of the waterfall (how much energy the water has)
>Create the electron flow
I. Basic Terms
Remember: 1 cell = 1.5V
Dry cells – when the electrolyte is a paste
Wet cells- when the electrolyte is a solution
Primary cells – cells that cannot be recharged
Ex. Manganese-oxide alkaline batteries
Secondary cells – cells that can be recharged by using electrical energy to reverse the chemical reaction
Ex. Car batteries, cell phones, Ni-Cd batteries
- will wear out over time
1. Electrons are transferred from the negative electrode through a wire – head to the load
2. Ions (Ex. Cu2+(aq)) from the electrode are transferred through the solution (electrolyte) to the positive electrode.
3. The anode eventually is
“eaten away” or used up
Draw a Cell in Action!Draw a cell with the following parts: -copper electrode, copper solution -nickel electrode, nickel solution -wire -bulb -2 beakers
Electrochemistry – the study of chemical reactions to produce electricity
Ex. H20 -->
2) Electroplating – coating a metal with a thin layer of a wanted metal
Ex. Plating inexpensive jewelry with gold
3) Galvanizing–coating parts with a layer of aluminum oxide (is much harder than aluminum)
Ex. Jewellery, screen doors, kitchenware
4) Electrorefining–removing impurities from metals
-impure metals are placed at (+) electrode and a pure metal is placed at (-) terminal.