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60 Cards in this Set
- Front
- Back
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__________ electricity deals with charges that exist between stationary objects.
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Static
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Name the three fundamental particles inside the atoms and each particle's charge.
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proton-positive
electron-negative neutron-neutral |
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What does the law of charges state?
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like charges repel
unlike charges attract |
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If an object has equal amounts of positive and negative charges, how would this object act?
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it would act as if it were not charged at all or neutral
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When we rub two objects together, one object gains __________, and therefore has a net _____ charge. The other object looses ____________ and therefore has a net _______ charge.
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gains electrons-has a net neg charge
looses electrons-has a net positive charge |
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In a ___________, positive and negative charges are stored in objects separated so that the charges cannot move between them.
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Capacitor
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What are some uses for capacitors?
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electrical appliances; sound equipment
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__________ is the charging of an object by placing it near a charged object, causing the electrons to shift.
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Induction
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The instrument which determines if an object is charged is called an ____________.
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electroscope
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Static or ____________electricity is an electrical charged produced by friction between two objects.
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tribo(electricity)
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(T/F) Dry skin is better than Teflon in giving up electrons when rubbed.
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T
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(T/F) Human hair becomes negatively charged when combed brusquely with a plastic comb.
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f
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(T/F) An electrical charge can be induced by touching an uncharged object with a charged object.
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T -induction
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(T/F) Van de Graaff invented a device, named in his honor, to measure the amount of electric charge an object has.
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F
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A(n) _____________ is an object or device that stores an electric charge.
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capacitor
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The "free electron theory" is used to explain why ______ are good electrical conductors.
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metals
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What theory is used to explain why metals are good electrical conductors?
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the "free electron theory"
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Silicon and germanium are good examples of__________.
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semiconductors
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The flow of electrical charge is called ___________.
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electrical current
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"Closed" or circular conducting paths are called ________.
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circuits
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Name the three parts of an electric circuit.
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Source, pathway, load
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________ is the amount of push required to establish current electricity.
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Voltage
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(T/F) A battery is a device that creates electrons.
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F
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(T/F) A battery may be regarded as an "electron pump."
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T
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(T/F) Current flows from high potential energy to low potential energy.
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T
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_________ is the unit of electrical charge.
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coulomb
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(T/F) Current varies inversely with resistance.
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T
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(T/F) Current varies directly with voltage.
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T
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(T/F) Electrical energy flows through a conductor with 100 percent efficiency.
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F
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(T/F) The thinner the electrical wire, the greater is the efficiency of current flow.
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F
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(T/F) In an electrical circuit comprised of a battery and three light bulbs linked in series, all bulbs go out when one bulb burns out.
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T
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Name three different types of electrical safety devices used to protect an electric circuit and you against excessive current or electrical hazards.
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fuses, breaker boxes, GFCI
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(T/F) Current flows through an "open" circuit.
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F
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________ measures how fast work is done.
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power
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A machine that does 1 J of work in 1 s uses ____ of power.
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1 watt
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Power=current x ________.
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voltage
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Resistance = voltage / ________.
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Current
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6.25 x 10(^18) electrons per second equals _________.
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1 amp
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If the current I = 0.2A and the resistance R=1000 ohms, what is the voltage?
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200V
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If V= 110 V and R=22000 ohms, then what is I?
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.005 amps
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_________ is the opposite of conductance.
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Resistance
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(Voltage/Resistance/Both V and R) affect the amount of current that flows through a circuit.
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Both V and R
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Dry skin tends to (gain/loose/repel/forget) electrons when you walk on wool carpets in the winter.
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loose
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When vigorously combed with a plastic comb, hair tends to (gain/loose/repel/forget) electrons.
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loose
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(T/F) Capacitors are miniature current generating devices.
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F
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The process of charging an object by shifting the paths of its electrons is called _______.
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induction
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A(n) _________ is a device that detects electrical charges.
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electroscope
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The _____________ ranks common materials as to how well they create static electricity.
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triboelectric series
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The __________ theory is used to explain why metals are good electrical conductors.
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free-electron
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Name one good example of a semiconductor used widely in computers.
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silicon
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The flow of electrical charge is called __________.
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current
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"Closed" or circular conducting paths are called _____.
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circuits
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________ is the amount of push required to establish current electricity.
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Voltage
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_______________ is energy associated with the flow of charged particles through a conductor.
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electrical energy
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(T/F) Current flow through a copper wire increases the entropy of the Universe.
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T
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_________ is the unit used to measure the amount of current that flows past a point in 1 second.
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amp
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(T/F) Volts = amps x ohms.
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T
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(T/F) Wats = volts x amps.
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T
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