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54 Cards in this Set
- Front
- Back
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What is the SI derived unit of electric charge (amount of "charge")?
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Couloumb
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A couloumb is defined as the charge transported by a steady current of one ____ in one ____.
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ampere / second
1C = 1A * 1s |
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What is dynamic electricity?
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The uniform motion of electrons through a conductor.
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What is static electricity?
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An unmoving accumulation of electric charge.
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What was the original reason for a charge being called "negative"?
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Because it was supposed to have a deficiency of the "fluid" that's transferred between objects rubbed together.
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What was the original reason for a charge being called "positive"?
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Because it was supposed to have an excess of the "fluid" that's transferred between objects rubbed together.
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An amp-hour (measure of amount of charge) is how many coulombs?
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3,600
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A mAh is how many coulombs?
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3.6
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What is the elementary charge?
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The charge of a single proton or electron.
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Electrons that easily leave their respective atom and move about within a certain material are known as?
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free electrons
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The relative mobility of electrons within a material is known as?
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conductivity
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Materials with high electron mobility (many free electrons) are called?
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conductors
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Materials with low electron mobility (few or no free electrons) are called?
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insulators
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Define voltage.
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Voltage is the measure of specific potential energy (potential energy per unit charge) between two locations.
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Voltage is always measured between
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two points.
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When a voltage source is connected to a circuit, the voltage will cause a uniform flow of electrons through that circuit called
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a current.
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In a single (one loop) circuit, the amount of current at any point is
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the same as the amount of current at any other point.
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If a circuit containing a voltage source is broken, the full voltage of that source will appear
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across the points of the break.
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The +/- orientation of a voltage drop is called the
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polarity.
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Like voltage, polarity is relative
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between two points.
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The opposition to electric current is
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resistance.
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The "friction" produced by electrons flowing against resistance manifests itself in the form of
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heat.
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When a circuit is complete and has no breaks it is known as a
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closed circuit.
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When a circuit contains breaks it is known as a
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open circuit.
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When a switch is in the position that causes a break in the circuit is the switch open or closed?
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open
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When a switch is in the position that completes a circuit is the switch open or closed?
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closed
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What type of notation shows current moving from + to -?
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Conventional flow notation
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What type of notation shows current moving from - to +?
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Electron flow notation
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What does it mean for a device to be nonpolarized?
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It allows current to flow through it in either direction.
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What does it mean for a device to be polarized?
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It only allows current to flow through it in one direction.
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Do the arrows on polarized devices in schematics point in the direction of current flow or against?
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They point against current flow because they assume conventional flow notation.
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The continuous movement of free electrons through the conductors of a circuit is called
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current
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The force motivating electrons to "flow" in a circuit is called
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voltage
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The opposition to motion of electrons through conductors is called
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resistance
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What is the symbol for current?
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I
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What are the symbols for voltage?
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E or V
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What is the symbol for resistance?
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R
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What is the unit of measure for current?
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Ampere ("Amp")
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What is the unit of measure for voltage?
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Volt
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What is the unit of measure for resistance?
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Ohm
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What is the unit abbreviation for current?
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A
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What is the unit abbreviation for voltage?
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V
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What is the unit abbreviation for resistance?
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Ω (Greek Omega)
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When do you use lower case for the mathematical symbols of electrical units of measure?
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When the quantity is described in brief periods of time. (A lightning strike for example.)
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What is the symbol for a coulomb?
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Q
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What is the unit abbreviation of a coulomb?
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C
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An amp is one ______ of electricity passing by a given point in one second of time.
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coulomb
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The general SI unit for measuring energy is the
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joule
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In terms of electricity, a joule is defined as
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passing an electric current of one ampere through a resistance of one ohm for one second.
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The relationship between volts and joules is
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1 volt is equal to 1 joule of electric potential energy per (divided by) 1 coulomb of charge.
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A 9 volt battery releases __ joules of energy for every coulomb of electrons moved through a circuit.
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9
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If you know the current and resistance in a circuit, how do you calculate the voltage?
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E = I * R
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If you know the voltage and resistance in a circuit, how do you calculate the current?
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I = E / R
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If you know the voltage and current in a circuit, how do you calculate the resistance?
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R = E / I
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