Principles of Engineering
Name ____________________
Quiz – Unit 1.3 – Energy Applications
Date __________ Period _____
Part 1 – Vocabulary Matching
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
Active Solar Energy Collection
Biomass
Conduction
Convection
Electrolysis
Energy
Entropy
First Law of Thermodynamics
Heat
Kelvin
K.
L.
M.
N.
O.
P.
Q.
R.
S.
T.
Passive Solar Energy Collection
Radiation
R-value
Second Law of Thermodynamics
Temperature
Thermal Equilibrium
Thermodynamic System
Thermodynamics
U-value
Zeroth Law of Thermodynamics
_____ 1.
A general statement of the idea that there is a preferred direction for any process.
_____ 2.
A law that if two systems are separately found to be in thermal equilibrium with a third system, the first two
systems are in thermal equilibrium with each other; that is, all three systems are at the same temperature.
Also known as thermodynamic equilibrium.
_____ 3.
A measure of thermal transmittance through a material.
_____ 4.
A part of the physical world as described by its thermodynamic properties such as temperature, volume,
pressure, concentration, surface tension, and viscosity.
_____ 5.
A property of an object which determines the direction of heat flow when the object is placed in thermal
contact with another object.
_____ 6.
A type of system that uses circulating pumps and fans to collect and distribute heat.
_____ 7.
A unit of absolute temperature and symbolized as K. Formerly known as degree Kelvin.
_____ 8.
Energy in transit due to a temperature difference between the source from which the energy is coming and
a sink toward which the energy is going.
_____ 9.
Plant materials and animal waste used especially as a source of fuel.
_____ 10.
Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will
sink.
_____ 11.
Refers to the property of a thermodynamic system, in which all parts of the system have attained a uniform
temperature which is the same as that of the system’s surroundings.
_____ 12.
Systems that do not make use of any externally powered, moving parts, such as circulation pumps, to move
heated water or air.
_____ 13.
The ability to do work.
_____ 14.
The function of the state of a thermodynamic system whose change in any differential reversible process is
equal to the heat absorbed by the system from its surroundings divided by the absolute temperature of the
system.
The law that heat is a form of energy, and the total amount of energy of all kinds in an isolated system is
constant; it is an application of the principle of conservation of energy. Also known as conservation of
energy.
_____ 15.
_____ 16.
The measure of resistance to heat flow.
_____ 17.
The process by which energy is transmitted through a medium, including empty space, as electromagnetic
waves. This energy travels at the speed of light. This is also referred to as electromagnetic radiation.
_____ 18.
The process separating the hydrogen-oxygen bond in water using an electrical current.
_____ 19.
The study of the effects of work, heat, and energy on a system.
_____ 20.
The transfer of heat within an object or between objects by molecular activity, without any net external
motion.
Part 2 – Calculations

A team of students built a solar hydrogen vehicle, and upon testing, came up with the following data:
Solar
Voltage (V)
Current (A)
Hydrogen Fuel Cell
Voltage (V)
1.25 V
Current (A)
1.25 A
2.5V
.25 A
Power (W) = V x A
21.
Calculate the power generated by the Solar Panel. (2 points)
____________
22.
Calculate the power generated by the Hydrogen Fuel Cell. (2 points)
____________
23.
Which method will allow the car to go faster? (1 point) (circle one)

Solar
Hydrogen
A team of students tests a material for its thermal conductivity (k). After 20 minutes in a heat box, the temperature is 48
C inside the box and 28 C on top of the material. The following data is true about this test:
Area (A) = .0232 m
2
Thickness of material (L) = .5 in = .0127 m
Time (t) = 20 min = 1200 sec.
P = kA
ΔT
L
Cp of water is 1000 J/kgC
k=
PL
AΔT
P=
Light bulb (P) = 25 W
mass of air (m) = .00432 kg
Q
Δt
24.
Calculate the thermal conductivity (k) for the material. (3 points)
____________
25.
Calculate Q for the heat flow through the material. (3 points)
____________
26.
Calculate the energy gained by the air in the heat box (Q) in this test. (3 points)
____________
Bonus – 3 points – no partial credit given – answer to within 50,000 J.
26.
If this material (using the k calculated in #24) was used in an actual wall with thickness 0.0254 m, T=15 C, and A=20
2
m , calculate the heat loss (Q) through the wall in one hour (3600 s). (2 points)
____________