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ammeter
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A device used to measure current flow.
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amp
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The shortened term for ampere.
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ampere
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A unit of electrical measurement that describes both an amount of electricity and the time it takes for electricity to travel a certain distance. One amp equals one coulomb per second.
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capacity
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The amount of electricity that can safely flow through a wire without the wire overheating.
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control
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A part or component in a circuit that controls the flow of electricity.
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coulomb
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The smallest quantity measurement of electrical current. A coulomb may be thought of as a "drop" of electricity.
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current
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The flow of electricity. Current is measured in amps.
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de-energized
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When power retained by sophisticated electronic devices is removed with a special shorting instrument.
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direct current
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Current that travels in one direction. Direct current does not reverse the direction of flow.
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directly proportional
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A relationship where a number increases or decreases together with another number at the same ratio. Directly proportional is the opposite of inversely proportional.
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electromotive force
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The force that pushes electrons through a conductor.
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in parallel
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When current passes through separate components in a circuit simultaneously because there is more than one path for current to flow.
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in series
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When current passes through all components in a circuit one after another because there is only one path for current flow.
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inversely proportional
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A relationship where a number either increases as another decreases or decreases as another increases. Inversely proportional is the opposite of directly proportional.
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joule
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The amount of power used when 1 amp flows through 1 ohm for 1 second.
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Kirchoff’s Voltage Law
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The universal truth stating that the sum of the voltages around any closed loop must equal zero.
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load
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The part or component in a circuit that converts electricity into light, heat, or mechanical motion. Examples of loads are a light bulb, appliance, or machine.
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multimeter
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A device that combines the functions of an ammeter, voltmeter, and ohmmeter.
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ohm
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The unit of measurement for electrical resistance.
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Ohm’s Law
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The universal truth stating that it takes one volt to push one amp through one ohm.
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ohmmeter
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A device used to measure resistance.
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path
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A conductor that directs electricity in a circuit. The path is often copper wire.
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power
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The rate at which a device converts electrical energy into another form, such as heat or light. Power is measured in watts.
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resistance
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The opposition to current flow. Resistance is measured in ohms.
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resistor
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A device that restricts current flow and produces work, such as heat.
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series circuit
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A route for the flow of electricity that has only one path.
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source
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The device that provides electrical power to a circuit. The source is the origin of electricity, such as a battery or power plant.
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volt
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A unit of voltage or electrical pressure.
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voltage
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A measure of electrical pressure or potential known as electromotive force. Voltage is measured in volts.
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voltage drop
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The amount of voltage needed to push a given amount of current through a given amount of resistance.
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voltmeter
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A device used to measure voltage.
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watt
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A unit of measurement for the wattage or power being used in a circuit. Watts require a change in energy to exist.
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wattage
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The power being used in a circuit. It is measured in watts.
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work
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The result of electricity flowing through some type of resistance. Work appears in the form of heat, light, or motion.
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