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63 Cards in this Set
- Front
- Back
What are the three principal parts of an atom and what charge does each carry?
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Electron -
Neutron No Charge Proton + |
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How many times larger is an electron than a proton?
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3 times the size
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How many times more does a proton weigh than an electron?
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1840 times more
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State the law of charges
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Opposite charges attract and like charges repel
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What force keeps an electron in orbit around the nucleus of an atom?
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Centripedal force
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How many valence electrons are generally contained in materials used for conductors?
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1 or 2
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How many valence electroncs are generally contained in materials used as insulators?
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7 or 8
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What is electricity?
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It is the flow of electrons
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What is a gluon
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A theoretical particle that bonds quarks together as well as protons and neutrons
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It is theorized that protons and neutrons are actually formed from a combination of smaller particles. What are these particles called?
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Quarks
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Which subatomic part of an atom contains a negative charge?
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Electron
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What subatomic part of an atom contains a positive charge?
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Proton
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What subatomic part of an atom contains no charge?
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Neutron
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The nucleus of an atom is formed by combining which two subatomic parts?
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Proton and Neutron
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What is electricity?
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A flow of electrons
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What are valence electrons?
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Electrons located in the outermost orbit of an atom
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What is a coulomb?
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A quantity of electrons equal to 6.25 x 10^18
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What is a conductor?
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A material that will permit electricity to flow through easily
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An insulator is made from a material that generally contains:
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7 or 8 valence electrons
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What is an insulator
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A material that hinders the flow of electricity
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A semiconductor is a material that generally contains
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4 Valence electrons
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What is direct Current?
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Current that flows in only one direction
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Define Voltage?
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1. Electrical Pressure
2. The difference in potential between two points 3. The force that drives or pushes the electricity through the wires. |
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Which subatomic part of an atom contains a negative charge?
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electron
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The nucleus of an atom is formed by combining which two subatomic parts?
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Proton and neutron
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What is electrcity
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A flow of electrons
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What are valence electrons?
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Electrons located in the outermost orbit of an atom
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What is a coulomb
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A quantity of electrons equal to 6.25 x 10^18
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What is a conductor?
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A material that will permit electricity to flow through it easily
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An insulator is made from a material that generally contains how many valence electrons?
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7 or 8 valence electrons
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what is an insulator?
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A material that hinders the flow of electricity
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A semiconductor is a material that generally contains how many valence electrons?
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4 Valence electrons
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What is direct current?
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Current that flows in only one direction?
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What are lodestones?
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Natural magnets
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What is a variable resistor?
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A resistor whose value can be changed over a certain range
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What is a potentiometer?
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A variable resistor used as a voltage divider
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What determines the amount of voltage produced by a voltaic cell?
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The materials it is made of
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What is a thermopile?
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A group of thermocouple connected in series
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What device is used to easure the specific gravity of the electrolyte in a cell?
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Hydrometer
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What else is voltage referred as?
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Potential difference or electromotive force
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What is sometimes used to help protect objects from lighting?
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Lightning rods
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What are ferromagnetic materials?
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Metals that are easily magnetized
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Whenever an electric current flows through a conductor, what is formed around the conductor?
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Magnetic field
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When is a hollow core resistor commonly used?
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High power rating
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The basic building block of the universe is a?
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Atom
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The _____ is the unit of electrical power
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Watt
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How should a hollow core resistor be mounted?
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Vertically
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A part of an atom that has a positive charge is called a?
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Proton
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What is the purpose of mounting a hollow core resistor vertically?
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Heat dissipation
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An atom is built of three parts
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Proton, Neutron and electron
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Define an ammeter
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A device that measures current
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What functions are resistors commonly used for?
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Limit flow of current through the circuit
Voltage divider |
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In a series circuit what is always constant
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Current
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In a parallel circuit, what is always constant?
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Voltage
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What is a quantity of measurement for electrons
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Coulomb
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The word static means?
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Not moving
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Magnetic lines of force are also called
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Flux
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Can a Primary cell be recharged
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No
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Can a secondary cell be recharged?
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Yes
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Thermocouples are what?
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A junction of two dissimilar metals that produce a voltage
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Piezoelectricity is produced when?
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Some materials are placed under pressure
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Is energy required to creaste a a magnetic field?
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Yes
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Is energy needed to maintain a magnetic field?
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no
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