flip cards – grade 9 academic science question 1 the unit of measurement of resistance in an...
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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