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Electrical Princples and Technologies Review

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Eric Tran

on 17 June 2013

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Transcript of Electrical Princples and Technologies Review

Electrical Principles and Technologies Review
Types of Energy, and Forms of Energy
Changing
Mechanical energy- The energy of motion or the potential to move.
Chemical energy- Energy from chemical reactions. This type of energy can be stored.
Electrical energy- Charged particles.
Thermal energy- The total kinetic energy in something. It's affected by heat. Heat ^= kinetic energy ^.
Types of Electricity
Static electricity- Particles losing or gaining electrons making it have a static charge. It's a type of electricity that is built up, and doesn't move.
Current electricity- Charged particles that flow. It's a constant flow of electricity.
Voltage- The amount of energy in each particle. Also called potential difference. Measured in volts (V.) Voltmeters are used to measure voltage.
Current- How fast the flow of electricity is. It is measured in amperes (A.) Ammeters measure current.
Ohm's Law
Ohm's law shows that voltage, current, and resistance all have a connection. Ohm also showed us how to calculate resistance. It's voltage/current and it is measured in Ohms. Resistance is the difficulty for electrons to flow through objects. Conductors let electricity bleed through easily, and insulators slow down electrons. Ohmmeters are used to measure resistance.
^ Wind energy-> mechanical energy-> electrical energy
^ Thermal energy->electrical energy. Known as a
thermocouple.
Types of Circuits
Parallel circuits- Each load has it's own pathway.
Series circuits- The current goes through all the loads, one after another.
Conversions
Transformer- A device that changes voltage.
Electric motor- A device that uses electrical energy
to make mechanical energy.
Electrical generator- A device that changes
mechanical energy into electrical energy.
Batteries, and Schematics
Electrochemical cell- Chemicals packed together. Electricity comes from chemical reactions.
Dry cells- Chemicals in a form of a paste.
Electrolyte- A paste or liquid that can produce electricity because they can create ions.
Ions- Atom(s) that are electrically charged because the atom(s) have gained or loss electron(s.)
Wet cells- Liquid electrolyte. Usually an acid.
Rechargeable cells- External electricity ran through the cell to give them a charge again.
Battery- Cells connected.
Primary cell- A cell that can create electricity from chemical reactions that can not be undone.
Secondary cell- Opposite of a primary cell. They are rechargeable.
^ Current electricity requires two things.
A source, and a circuit.
Power, Energy, and Efficiency
Power- How fast a device converts energy. Power is measured in watts(W.)
Energy- The amount of joules or kilowatts over time. Energy is measured in joules(J) or kilowatt hours(kWh). kWh=watts/1000*h, and h meaning hour(s.)
Efficiency- How good the device is at converting energy. It's a comparison between input energy, and output energy. Efficiency is measured in %. When energy is becoming converted (like electrical to mechanical) some of the input energy is lost. Friction, and heat loss are big causes. To improve efficiency, we need to cut down on heat loss, lubricate joints, use bearings, or to buy better products. Reducing energy wasted= better efficiency.
The Formulas
Energy Sources
Renewable Vs. Nonrenewable
They all have costs and problems, but we need them.
Conservation Vs. Sustaining
Conservation is trying to keep the resources. Trying to protect them. We can do that by saving energy. Sustainability is using the resources we have at a constant pace that won't deplete the resources, but keep us satisfied.
^ Bike to school to conserve energy.
^ Limit computer usage to sustain our resources.
Stay safe!
Electricity can be dangerous.
Use common sense, and
avoid danger!
Full transcript