# Electric Energy  The energy of electrical charges  In order for charges to move, an electric field (area where another object experiences a force) must.

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Electric Energy  The energy of electrical charges  In order for charges to move, an electric field (area where another object experiences a force) must be set up and start the electrons moving

Voltage:  How much work is needed to move a charge between 2 points  The higher the voltage, the more electricity is released per charge  The potential difference between two points that cause charges to move  Measured in volts (V)

Current: - The flow of charges, - The rate at which charges pass through a point - Measured in amperes (A)

Voltage & Electrical Current  As long as there is a voltage between 2 points on a wire, charges will flow through the wire  The greater the voltage, the greater the current

2 Types of current in electrical energy  Direct  Alternating

Direct current  Charges flow in the same direction  Example: batteries

Indirect current  Charges shift flow from one direction to another  Advantage is that the voltage can change between the electrical producer & the user  22,000 V to 120 V

Resistance  A factor that that determines the amount of current in a wire  The opposition to the flow of electric charge; “electrical friction”  Depends on  Material -Good conductors have low resistance  Thickness – thicker, less resistance  Length – shorter, less resistance  Temperature- hotter, more resistance due to vibration

Ways that electricity can be generated Ways that electricity can be generated  Generators – ME to electrical  Cells –chemical & radiant to electrical  Thermocouples –thermal to electrical  Photocells – light energy to electrical

Cells  Cells change chemical or radiant energy into electrical energy  Wet and dry cell batteries

 http://www.ndt- ed.org/EducationResources/HighSchool/ Electricity/alternatingcurrent.htm http://www.ndt- ed.org/EducationResources/HighSchool/ Electricity/alternatingcurrent.htm http://www.ndt- ed.org/EducationResources/HighSchool/ Electricity/alternatingcurrent.htm  http://videos.howstuffworks.com/hsw/133 73-understanding-electricity-how- electricity-works-video.htm

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