DC Theory test 1
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DC Theory test 1
dc theory first test
first test for d.c. theory
An invisible force that can produce heat, motion, light, and other physical effects is?
What convention did benjamin Franklin Suggest
Like objects repel, opposites attract
as electrons flow through a conductor, the number of of electrons is measured by the number of coulombs per second that move pass a _____ in a circuit
The unit of electrical current flow is?
The coloumb is defined as the total charge of?
6.25 x 10^18 electrons
The amount of current flowing through a circuit can be measured with a?
the thoery of current flow in which current flows from negatve to positive is?
Electron current flow
electrical potential of one volt will cause one coulomb of current to do one ____ of work
Instrument used to measure Resistance?
Completed path for current to flow from a source of current through a load and back to the source of current?
when current finds and alternate path back to source, rather than taking path through load, this is called a?
ohms law states that it takes one volt to push one amp through
one ohm of resistance
current flow in an electrical circuit is caused by voltage and opposed by ?
in a circuit current is directly proportional to voltage and _______ proportional to the resistance
the unit of measurment for power is ?
one horse power eqauls to
power is consumed when voltage is apllied to a circuit and ____ flows through the load.
The _____ the amount or unit of energy used to measure th amount of heat or work produced or consumed in a system
joules law is ?
the total amount of heat produced in a conductor is directly proportional to the resistance times the square of the current.
the smallest particle to which an element can be reduced yet still retain the characteristics of a an element
3 main parts of an atom
electrons protons nuetrons
nucleus of a atom consist of the
proton and nuetron
which particle has a negative charge and rotates around the nuecleus of the atom
what keeps orbiting electrons from peing pulled into the nuecleus
what is a conductor
a material that allows electric current to flow easily
what is a insulator
a material that strongly resist the flow of electricity.
how many electrons do semiconductors have in the valence shell
what are the different ways to make electricity
friction, chemicals, heat, pressure, light, magnetism
what determines the individual cell voltage of a battery
the metal being used for the plate.
when aluminu and silver are used for a battery what metal will be the negative electrode and why?
aluminum because it will receive more electrons than silver
name the two catogories that batteries are divided into
primary cells , secondary cells
what type of battery cell can be recharged several times ?
when two dissimalar metals are joined at a junction and then heated
a mechanical device designed to allow or interrupt current flow in a circuit
a switch that makes or breaks one circuit path ata time is reffered to as a ?
single pole switch
what switches are used to control a light in two locations
three way switches