Transcript Flip Cards - Grade 9 Academic Science Exam 2013

Flip Cards – Grade 9 Academic Science
Question 1
The unit of measurement
of resistance in an
electrical circuit
Flip Cards – Grade 9 Academic Science
Answer 1
Ohms
Resistance is measured
in units of ohms
The symbol is Ω
Flip Cards – Grade 9 Academic Science
Question 2
Two neutral materials are
rubbed together to
produce a static electrical
charge by transferring or
moving electrons from
one of the materials to
the other material.
Flip Cards – Grade 9 Academic Science
Answer 2
Charging by Contact
According to the Triboelectric
Series, some materials tend to
readily take electrons while other
materials give electrons. If
electrons are taken, the material
has a negative imbalance (i.e.,
more negative electrons than
positive protons) and the material
becomes negatively charged.
Flip Cards – Grade 9 Academic Science
Question 3
The formula for determining Percentage
Energy Efficiency
In a question, “What is the Percent Efficiency
of an electrical fan is it uses 500 J of energy
to produce 10 J of usable energy to turn the
fan blades?”
Flip Cards – Grade 9 Academic Science
Answer 3
% Efficiency = Energy Out / Energy In X 100
If the fan uses 500 J of energy, the term “uses” means the
fan took that energy IN
If the fan produces 10 J of energy, the term “produces”
implies that it is the energy given off or OUT
Thus, % Efficiency = 10 / 500 X 100
Flip Cards – Grade 9 Academic Science
Question 4
An imbalance of
electric charge on the
surface of a material
Flip Cards – Grade 9 Academic Science
Answer 4
Static Electricity
Flip Cards – Grade 9 Academic Science
Question 5
Charging a neutral
object by contact with
a charged object
Flip Cards – Grade 9 Academic Science
Answer 5
Charging by
Conduction
Flip Cards – Grade 9 Academic Science
Question 6
A material that lets
electrons move
through it easily
Flip Cards – Grade 9 Academic Science
Answer 6
Conductor
Flip Cards – Grade 9 Academic Science
Question 7
The energy provided
by the flow of
electrons in an
electric circuit
Flip Cards – Grade 9 Academic Science
Answer 7
Electrical Energy
Flip Cards – Grade 9 Academic Science
Question 8
Like charges repel
AND opposite
charges attract
Flip Cards – Grade 9 Academic Science
Answer 8
Law of Electric
Charges
Flip Cards – Grade 9 Academic Science
Question 9
Charging a neutral
object by bringing
another charged
object close to but not
touching the neutral
object
Flip Cards – Grade 9 Academic Science
Answer 9
Charging by
Induction
Flip Cards – Grade 9 Academic Science
Question 10
A material that does
not easily allow the
movement or
passage of electrons
through it
Flip Cards – Grade 9 Academic Science
Answer 10
Insulator
Flip Cards – Grade 9 Academic Science
Question 11
A circuit in which the
loads are connected
end-to-end so that
there is only one path
for electrons to flow
Flip Cards – Grade 9 Academic Science
Answer 11
Series Circuit
In a series circuit when
one load is removed
(e.g., light stops working),
all loads stop working.
Flip Cards – Grade 9 Academic Science
Question 12
Natural energy resource that is
unlimited (e.g., solar energy,
wind energy) or can be
replenished by natural
processes in a relatively short
period of time.
Flip Cards – Grade 9 Academic Science
Answer 12
Renewable Resource
Flip Cards – Grade 9 Academic Science
Question 13
A device used to measure
electrical current
Flip Cards – Grade 9 Academic Science
Answer 13
Ammeter
An ammeter is wired
directly into the circuit as a
series circuit. It measures
the current flowing through
a load.
Flip Cards – Grade 9 Academic Science
Question 14
The difference in electric
potential energy per unit charge
measured at two different points
and measured in volts (V)
Flip Cards – Grade 9 Academic Science
Answer 14
Potential Difference
or Voltage
Flip Cards – Grade 9 Academic Science
Question 15
The transfer of electrons
between two neutral objects
(made of different materials)
that occurs when they are
rubbed together or come into
contact
Flip Cards – Grade 9 Academic Science
Answer 15
Charging by
Friction
Flip Cards – Grade 9 Academic Science
Question 16
The rate at which electrical
energy is produced or used
Flip Cards – Grade 9 Academic Science
Answer 16
Electrical Power
Flip Cards – Grade 9 Academic Science
Question 17
A circuit in which the loads are
connected by branches so that
there are two or more paths for
electrons to flow.
Flip Cards – Grade 9 Academic Science
Answer 17
Parallel Circuit
In a parallel circuit when
one load is removed (e.g.,
light goes out), the other
loads continue to work.
Flip Cards – Grade 9 Academic Science
Question 18
The measurement of units of
electrical current
Flip Cards – Grade 9 Academic Science
Answer 18
Amps (A)
Current (I) is measured
as ampreses
Flip Cards – Grade 9 Academic Science
Question 19
A device that reduces the flow
of electric current.
Flip Cards – Grade 9 Academic Science
Answer 19
Resistor
A resistor could be a
lamp, stove, computer,
washing machine or
electric can opener
Flip Cards – Grade 9 Academic Science
Question 20
I=V/R
The relationship between
voltage, current and resistance
Flip Cards – Grade 9 Academic Science
Answer 20
Ohm’s Law