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Light strike the semiconductor and causes electrons to break loose and move freely. Ex. Solar Cell

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Filament made of high resistance metals that glows brightly when current passes through it. Ex. Light bulb

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Piezoelectric effect in reverse. Crystal is puller or compresses a potential difference builds up on the opposite side of the crystal. Ex. BBQ lighter

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Thermo-electric generator converts heat to electricity without moving parts.

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A heat pump uses an electric motor to drive a refrigeration cycle, that draws heat energy from a source such as the ground or outside air and directs that heat into the space to be warmed.

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The ability to do work

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Current has multiple ways to flow. One bulb may not work but the others will. Controlled with switches.

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Quartz or crystal are connected to an electric current and will expand or retract. Ex. Inside of a siging card.

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Current only has one path to flow. One bulb dosen't work the others don't either.

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Do not have a fixed resistance instead, their resistance changes in response to temperature, light or voltage.

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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

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Slows the motion of electrons. Converts electrical energy into other forms. Measured in ohm's.

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Must be measure between two points in the circuit.

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Energy for pushing electrons is available if positive and negative charges are separated. Measured in volts (V)

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Device that measures electric current in a circuit

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Current is the movement of electrons, or the amount of charge passing a point in a conducting wire every second. Measured in amperes (I)

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A switch or a device, that turns the circuit on and off.

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A device to convert electricity into another form.

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Provides electrical energy - usually a battery

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A complete and closed path around which a circulating electric current can flow.

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Connecting an object to the earth safely to neutralize an object.

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An electric discharge is the release and transmission of electricity in an applied electric field through a medium such as a gas.

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Little or no resistance to charge movement.

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Better conductors than an insulator, but not as good of a conductor.

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A conductor is a object or type of material that allows the flow of electricity in one or more directions.

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Opposite charges attract one another. Like charges repel.

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Static electricity is an imbalance of electric charges within or on the surface of a material.