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Ch.17 electricity

Electricity

QuestionAnswer
Law of electric charge Says that like charges repel and opposite charges attract.
Electric Force the force between charged objects.
Electric field a region around a charged particle that can exert a force on another charged particle.
3 ways to “Charge It” Friction, Conduction, Induction
Conservation of Charge states that when you charge particles by any method, no charges are created or destroyed.
How can a charge be detected You can use an electroscope to detect the charge of a particle.
Conductors a material in which charges can move easily.
Examples of conductors Copper, Silver, Aluminum, and Mercury.
Insulators a material in which charges cannot move easily.
Examples of insulators Rubber, glass, wood, and air.
Static Electricity the buildup of electric charges on an object.
Electrical discharge the loss of static electricity as charges move off an object.
Lightning A giant electrical discharge.
Lightning Rods a pointed rod connected to the ground by a wire.
Grounded Objects that are in contact with the Earth or ground.
Dangerous places when it is lightning include Any open areas with tall things sticking out such as the beach, or a golf course.
Cell A device that produces an electric current by converting chemical energy into electrical energy.
Battery Also converts chemical energy into electrical energy and is made up of several cells.
Parts of a battery – electrolyte & electrode An electrolyte is a cell that contains a mixture of chemicals and conducts a current. An electrode is the part of a cell through which charges enter or exit.
Types of Battery Cells There are wet cells and dry cells. Wet cells contain liquid electrolytes. Dry cells contain solid, paste-like electrolytes.
What is the relationship between potential difference & volts Potential difference is the energy per unit charge and is expressed in volts.
Photocells & examples A photocell is the part of a solar panel that converts light into electrical energy.
Thermocouple Converts thermal energy into electrical energy.
Electrical current The rate at which a charge passes a given point.
Two types of electrical current AC is alternating current and DC which is direct current.
Direct Current the charges always flow in the same direction.
Alternating Current The charges continually switch from flowing in one direct to flowing in the reverse direction.
Voltage the difference in energy per unit charge as a charge moves between two points in the path of a current.
Resistance The opposite to the flow of electric charge.
What is the relationship between resistance & current Resistance determines the current in a wire.
How thickness, length & temperature effect electrical current Thickness and length affect resistance. A thick pipe has less resistance than a thin pipe and a short pipe has less resistance than a long pipe. The resistance in metal increases as the temperature increases.
What is Ohm’s Law you can use Ohm’s law to find the current in a wire.
Electrical Power Formula voltages X current or P
Watt The unit used to express power.
How is household energy measured by the energy company measured in Watts.
Created by: AD12398
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