Download Test #2 Review

The Four Energy Systems
Mechanical
Fluid
Electrical
Thermal
The Prime Movers of the
Four Energy Systems
Mechanical
- Force
Fluid- Pressure
Electrical- Voltage
Thermal- Temperature
International System of Units
The SI unit of current is the ampere;
that of potential difference is the volt;
and that of resistance is the ohm.
Electric Current
Electric current is by
definition the flow of electric
charge. The SI unit of electric
current is the ampere (A).
Ampere
The ampere (symbol: A) is the SI base
unit of electric current. It is named after
André-Marie Ampère, one of the main
discoverers of electromagnetism.
Voltage
Voltage is the difference of
electrical potential between two
points of an electrical network,
expressed in volts
Voltage
This difference is proportional to the electrostatic
force that tends to push electrons or other chargecarriers from one point to the other. Potential
difference, electrical potential, and electromotive force
are measured in volts, leading to the commonly used
term voltage.
Ohm’s Law
The law is named after the
physicist Georg Ohm, who
published it in 1826.
Ohm's law states that, in an electrical circuit,
the current passing through most materials is
directly proportional to the potential difference
applied across them.
Ohm’s Law
I=V
R
where I is the current, V is the potential
difference, and R is a proportionality constant
called the resistance. The potential difference is
also known as the voltage drop, and is sometimes
denoted by E or U instead of V.
Circuit
A Source
A Load
A Path
A Series Circuit
In a Series Circuit there
is only One path for the
current to travel.
A Series Circuit
In a Series Circuit if one
load is interrupted, then
the whole circuit shuts
down.
A Series Circuit
A good example of a
“Series Circuit” is a string
of Christmas Tree Lights.
A Parallel Circuit
In a Parallel Circuit there
is Multiple paths for the
current to travel.
A Parallel Circuit
In a Parallel Circuit if
one load is interrupted,
the rest of the circuits
continue to operate.
A Parallel Circuit
A good example of a
“Parallel Circuit” is the
Lights on your car.
In what fundamental way does
energy differ from matter?
Energy does not have
mass.
Kinetic energy is associated
with_____________?
The Movement of
Molecules.
Potential energy is defined as
_____________?
Energy which is stored.
How does temperature equalize
itself between two temperatures
_____________?
Heat moves from the
warmer object to the
colder object.
When pressure increases what
happens to temperature?
When pressure
increases, temperature
increases.
When pressure decreases what
happens to temperature?
When pressure
decreases, temperature
decreases.
What happens to particles when
temperature is high?
Particles move faster
and bounce into each
other.
What happens to particles when
temperature is low?
Particles are slow
moving and hardly
bounce into each other.
Define Temperature in a sentence
or two?
Describe the relationship between
heat energy and molecular
motion, including how heat moves
through a system.
What are the two scales to
measure temperature.
Celsius & Fahrenheit
Temperature difference in a
system “acts” like a force when
moving heat energy.
With what instrument do we
measure temperature .
Thermometer