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85 Cards in this Set
- Front
- Back
Force equals mass times what?
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Accleration
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What is a force?
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Is a push or pull that causes a change in shape or a change in motion
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What is weight density?
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Is the ratio of an objects weight to its volume
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What is a Hydrometer?
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is used to measure density or specific gravity in liquids
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What is temperature difference?
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acts as a prime mover in thermal mover in thermal systems because heat always moves from warmer regions to cooler regions
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What is heat?
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Is a form of energy characterized by the vibrating movement of atoms and molecules
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What is temperature?
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Is the measure of the average energy of motion of moecules in a substance?
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What is Thermocouples?
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Use three wires of two different metals to measure temperature
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What does Multimeters measure?
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Measure voltage, amperage, and resistance (in Ohms)
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What is an anode?
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The positive pole or electrode in a battery.
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What is a Cathode?
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The negative pole or electrode
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What is absolute pressure?
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Is measured in reference to a vacuum(Zero Pressure)
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What are two types of fluids?
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Hydraulic and pneumatic
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What is weight?
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Is the measurement of gravity times mass
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What is torque?
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Is the force-like quantity in rotational mechanical systems
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______is the work going into a system, preformed by human or a motor
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Input Work
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______is the work done by the system
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Output Work
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______is output work divided by inout work, multiplied by 100.
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Efficiency
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______are used to measure input and output force.
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Spring scales
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_____is preformed when a mass is moved in a straight line.
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Linear Mechanical Work
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_____is preformed when a mass is moved around axis or rotation
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Angular Mechanical Work
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_____causes an object to start moving,stop moving,or change direction.
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Mechanical Work
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_____is equal to the pressure difference times the difference times the volume moved.
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Fluid Work
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The cross-sectional area of a cyllinder can be found by multiplying____
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.7854 by the diameter squared
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___is done when the voltage move a specified amount of electrical charge
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Electrical Work
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What is the basic english unit of work?
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Foot-pound
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What is the basic SI unit of work?
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Newton-Meter
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____is the quantity of charge equal to 6.25 times 10^8 electrons
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Coulomb
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What is the symbol of coulombs?
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q
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What is the unit of electrical work?
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Joule
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What is rate?
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is a displacement-like quantity divided by elapsed time
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What is Velocity?
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Is the measure of linear mechanical work.
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What is speed?
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Is similar to velocity,but it is a scalar(no directional notation)
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What is angular rate?
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is expressed in radians per second or revolutions per minute
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What many radians are in one revelotion?
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6.28
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What is accleration?
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is the rate at which speed increases or decreases.
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What are the units of accleration?
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foot/second^2 and meters/second^2
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What is flow rate?
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is the volume of fluid moved in a given period of time
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What is the symbol for volume flow rate?
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Qv
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What is Viscosity?
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is the quality of a substance related to its thickness
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What is electrical rate?
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is the amout of charge moved in a given eriod of time
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What is an Oscilloscope?
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can measure frequency as well as voltage waveform
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What is the symbol of heat flow rate?
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Qh
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What is dewer flask?
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is used to contain and store heat energy
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What can a thermocouple thermometer be used to measure?
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heat flow rate
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Whats the equation for resistance?
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resistance equals a force like quantity divided by a rate
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What are two forms of resistance in mechanical system?
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friction and drag
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What is kinetic friction?
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must overcome to keep a moving object in motion
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What is static friction?
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must overcome to start a object in motion
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What is ohm's law?
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is the standard equation for calculating eletrical resistance
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What are resistors?
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are used to control the amount of voltage in a circuit
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What are conductors?
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are materials such as copper and solder that permit the free floe of electrons
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What are insulators?
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are materials such as plastic and ceramic that do not permitthe free flow of electrons
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What are semi conductors?
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are materials such as silicon that allows some current to pass through
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What is resistivity?
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is the quality of a material that describes how much its permits electricity to flow through it
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Waht is thermal resistance?
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is opposition to the flow of heat through a material
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What is the equation for thermal resistance?
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Rt=DT/Qh
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What is thermal conductivity?
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is the quality of a material that describes how well its transmits heat
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What is the R-Value?
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is the rating based on its ability to resist heat flow
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What is the fromula for calculating thermal resistance?
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Rt=l/kA
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What is energy?
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is the ability to do work
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What is potential energy?
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is energy stored in a mechanical,fluid,or electrical device by virtue of a change in shape or position
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What is the formula for potential energy?
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Ep=force x height
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What is gravitational potential energy?
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is energy that an object has because it has bee raised against the gravitational pull of the Earth.
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What is Elastic potential energy?
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is energy that has an object has been temporarily changed
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What is kinetic energy?
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is the energy of motion possessed by a moving body
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What is moment of inertia?
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is the quantity that acts like a masss in rotational mechanical systems
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What is electrical energy?
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is the potential energy and kinetic energy that are associated with the position or movement of electrical charge
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What is capacitors?
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are electronic devices consisting of conductors seperated by insulators
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What is capacitance?
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is measured in farads and is calculated by the formula C=q/V
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What is inductors?
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are electronic devices that consist of a coil of wire wrapped around a core
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What are the units of energy?
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Calories and Btu
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What is conduction?
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is the movement of heat energy from warmer regions to cooler regions
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What is convection?
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is the transfer of heat energy by a movement of a flud medium from one region to another
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What is radiation?
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is the transfer of heat energy by electromagnetic radiation
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What is power?
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is the rate of doing work
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What is the equation for power?
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P=work/time
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What is the english units for power?
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foot-pounds/second
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What is the SI units for power?
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watts
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One watt equals to_______
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one joule per second
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One horsepower equals to_______-
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550 foot-pounds/second
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One horsepower equals____
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746 watts
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What is kilowatt-hour?
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is a unit of energy
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One watt equals_____
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one volt times ne amp
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In rotational mechanical systems,power equal torque times______
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Angular rate
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