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