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42 Cards in this Set
- Front
- Back
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Who named positive and negative charges?
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Ben Franklin
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Protons have ___ charges.
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positive
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Electrons have ___ charges?
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negative
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Like charges _____ each other.
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repel
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Different charges ____ each other.
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attract
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What is an electric field?
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The area that surrounds a charge
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The buildup of charges on an object when the charges do not flow is called
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STATIC ELECTRICITY
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Protons are bound ______. but electrons can _____ freely.
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tightly
flow |
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In matter, each positive charge is balanced by negative charge resulting in _____ ___.
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neutral electricity
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What is the transfer of electrons from one object to another by rubbing called?
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FRICTION
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The transfer of electrons from one object to another by direct contact.
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CONDUCTION
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The movement of electrons to one part of an object caused by the electric field of another object is called _____?
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INDUCTION
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Are charges created or destroyed?
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NO, but they are moved or transfered
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IN static cling, when a negative and positive charged object rub together what happens
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Electrons move until both objects have the same charge.
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When electron move until both have the same charge, what does that result in?
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Loss of static electricity, or static cling
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How does humidity effect static discharge?
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extra electrons are carried off by water molecules in the air, preventing the build up of static electricity
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____ is a dramatic example of static DISCHARGE.
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LIGHTNING
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What is used to detect static charge?
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ELECTROSCOPE
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The DIFFERENCE in electrical potential between two places is called what?
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ELECTRICAL POTENTIAL
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The force or potential difference that causes current to flow through an electric current is?
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VOLTAGE
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VOLTAGE SOURCES create a ___ _____ in an electric circuit
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potential difference
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Current depends on the _____ (opposition) offered by the material through which it travel.
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RESISTANCE
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Resistance also depends on how well the material ______ ELECTRICITY.
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CONDUCTS
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The greater the resistance, the ____ the current there is for a voltage.
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LESS
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A unit of resistance is called an ____?
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OLM
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What is used to measure potenial difference?
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voltmeter
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What is used to measure current?
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Amneter
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What does Ohm's Law state?
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Resistance= Voltage/current (or Olms) =Volts/Amps
R=V/I or I=V/R or V=IR |
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When parts of an electric circuit are connected one after another it is called a ____ ____?
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SERIES CIRCUIT
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In a SERIES CIRCUIT there is ___ path to take?
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ONE
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Each part that is added to the circuit causes ____ _____.
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added resistance
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If you want to measure the current through a device in circuit, the ammeter has to be what?
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Connected in series with the device.
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When you have different parts of the circuit on SEPARATE BRANCHES, you have ____ ____?
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parallel circuits
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In the parallel circuit, there are ____ paths to take.
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several
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What does adding branches do?
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Reduces resistance on the circuit and brightness of bulbs will not change
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When you measure voltage across a device, the voltmeter and the device should be wired how?
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parallel
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When a connection allows a current to take an unintended path?
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Short circuit
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If you touch an exposed wire, what might happen?
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an electrical current can flow through your body
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If a short occurs it is best to be grounded, why?
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current will go directly into the earth
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What does a third prong do?
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connects the metal shell of an appliance to the ground wire of a building.
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A metal rod mounted on the roof of a building in order to protect a building from lightning is ?
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Lightning Rod
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A safety device that uses an electromagnet to shut off the circuit when current gets too high?
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circuit breaker
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