Study Physics II 8.1 - 8.5 Flash Cards

 
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Physics II 8.1 - 8.5

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most electrical measuring instruments make use of what effect of the electrical current
magnetic effect
consists of a flow of charged particles
electric current
the meter should be viewed from a position directly in front the pointer to avoid what
parallax
what is a measuring instrument which includes a multirange ammeter, multirange voltmeter, and multirange ohmmeter all in one unit
multitester
when an electric current flows through a conductor, heat is created
thermal effect
what are the two types of effects measured
thermal effect
magnetic effect
what are the parts of a meter
movement
pointer
scale
case
the part which encloses and protects the metering device
case
the part calibrated to visually indicate the various quantities measured
scale
what indicates the displacement on a scale
pointer
what is the best weapon against electrical shock
knowledge of electricity and common sense
what type of fire extinguisher do you only use on an electrical fire
CO2
what are the emergency steps in case of an electrical fire
de energize the main circuit
evac patients
call 911
use a fire extinguisher if possible
document in a detailed report
what are some of the common danger areas in an xray department
machines with frayed wires
improper or non existent grounding on machines
darkroom ( wet floors )
ungrounded mobile machines
what are some of the factors that determine whether or not an electrical shock is fatal
person involved
state of health
length of shock
what is the amperage of ventricular fibrillation
.1 -3.0 amps
what is the amperage of the current which has pain. possible fainting, exhaustion, mechanical injury, and possible heart and respiratory failure
.05 amps
what is the amperage of the can't let go current
.016 amps
what is the amperage of the threshold of perception and sensation of tingling
.001 amps
what determines the severity of electric shock
amount of current
area of the body that is involved
what is the formula for a parallel circuit for figuring out the total power for the circuit
P(t) = I(t) x V(t)
what is the formula for a parallel circuit for figuring out the disipated power by each resistor
P(1) = I(1) x V(1)
in which circuit is the total power in the circuit is the sum of all the power consumed in each branch
parallel
what type of circuit is the voltage the same in all branches
parallel
in which circuit will the current always take the path of least resistance
parallel
in a parallel circuit what is the formula for determining total current
I(t) = V(t) / R(t)
what is ohm's law for solving for total resistance
R(t) = V(t) / I(t)
in which circuit will the total current be equal to the sum of the current in each branch
parallel
in a parallel circuit what is the formula for total resistance
1/R(t) = 1/R(1) +1/R(2) + 1/R(3) .....
in which circuit is the total resistance always less than the lowest valued resistor
parallel
in which type of circuit is the current constant through each resistor
series
what is the circuit that there are more than one path for the current to flow
parallel circuit
in a series circuit what is the formula for power dissipated per resistor
P(1) = I(1) x V(1)
in a series circuit what is the formula for power
P = I x V
in a series circuit what is the formula for voltage drop
V(1) = I(1) x R(1)
what is the amount of potential energy across a resistor
voltage drop
in a series circuit what is the formula for total current
I(t) = V(t) / R(t)
in a series circuit what is the formula for total resistance
R(t) = R(1) + R(2) + R(3) ......
what are the two principle types of circuits
series and parallel circuits
a circuit is considered to be what when electrons have a path to flow through from one end to another
closed
a circuit is to be considered what when any break occurs which prevents the flow of electrons from one end of the circuit to another
open
what is the formula for power
P = I x V
what is the formula for current
I = V/R or V = I x R
the value of the current in a metallic circuit equals the potential difference divided by the resistance
Ohm's Law
ohm's law was created by who
George Simon Ohm
four factors that affect the resistance of conductors
type of material
length
cross sectional area
temperature
that property of the circuit or substance which opposes or hinders the flow of an electric current
resistance
what is the type of current that oscillates back and forth and is supplied by AC generators
alternating current
what is the type of current that flows in one direction and is supplied by batteries or generators
direct current
what are the two types of electric current
direct and alternating
what is the unit of measure for current
amp
the amount of electrical charge flowing per second
current
what is defined as that potential difference which will maintain a current of one ampere in a circuit whose resistance in one ohm
volt
what is the unit of measure for potential difference
volt
a difference in electrical potential energy between two points in electric circuit
potential difference
what are the three main factors that characterize a simple electric circuit which is carrying a steady direct current of constant strength always flowing in the same direction
potential difference
current
resistance
what does the current in a circuit supplied by a battery have
a definite direction or polarity
when a circuit is completed it is called what
a closed circuit
what is it called when a circuit is broken
open circuit
current only flows in a electric circuit when
when there is a source and the switch is closed
what are the simple parts of an electrical circuit
battery
conductor
load or resistance
the path over which the current flows
electric current
what conditions may an electrical current occur under
vacuum
gas
ionic solution
metallic conductor
moving particles that carry an electrical charge
current carriers
the science of electrical charges in motion, it is also known as current electricity
electrodynamics
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