09 Electricity

Question 1

Energy is transferred in electrical systems by the movement of…

Answer 1

electric charges

Question 2

A circuit

Answer 2

A path through which electric charge can move

Question 3

Electric current

Answer 3

The flow of electric charge in a circuit

Question 4

An example of a simple electric circuit

Answer 4

A cell

Conducting wires

A light bulb

Question 5

A system that transfers electrical energy

Answer 5

A circuit

Question 6

A simple example of a energy source in a circuit

Answer 6

A cell or battery

Question 7

A cell in a circuits provides energy by

Answer 7

Chemical energy converted into electrical energy

Question 8

The energy conversions involved in a lit light bulb

Answer 8

Electrical energy converted into thermal and light energy

Question 9

The energy conversions involved in a complete circuit including a cell, conducting wires and a light bulb.

Answer 9

• Chemical energy in cell
• converted into electrical energy,
• flow of charges use kinetic energy,
• in the bulb this is converted into thermal
• and light energy

Question 10

An open circuit

Answer 10

Electric current cannot flow

Question 11

A closed circuit

Answer 11

Electric current is allowed to flow

Question 12

The more cells that are connected in a circuit

Answer 12

The greater the amount of electrical energy

Question 13

A switch

Answer 13

A circuit component / a device It opens and closes the circuit used to control electrical circuits

Question 14

Parts of a circuit

Answer 14

Components

Question 15

Conducting wires

Answer 15

Materials through which electrons can easily flow

Usually made of metals E.g. copper wires

Question 16

A cell

Answer 16

A chemical system that stores electrical potential energy

Question 17

A battery

Answer 17

Two or more cells forming a chemical system that stores electrical potential energy

Question 18

Device that controls electrical energy flowing into a house

Answer 18

Mains switch

Question 19

You must always switch of unused appliances

Answer 19

To conserve electrical energy

To prevent accidental fires and electric shocks

Question 20

Two important parts of a cell or battery

Answer 20

Positive terminal

Negative terminal

Question 21

Direction electrons flow in a circuit

Answer 21

From the negative terminal of the cell

Through the conducting wires

To the positive terminal of the cell

Question 22

Resistor

Answer 22

Materials that conduct electrical charge but oppose or resist it

Question 23

A filament

Answer 23

The resistance wire in a light bulb

Question 24

Effects of electric current

Answer 24

cause a resistance wire to heat up

cause a magnetic field

cause chemical reactions

Question 25

Short circuit

Answer 25

- A circuit that allows current to flow in an unintended circuit - The path of least resistance

Question 26

Magnetic field

Answer 26

lines of force surrounding a permanent magnet or a moving charged particle

Question 27

Effects and possible effects of a short circuit

Answer 27

More electons move through the wires Conducting wires heat quickly Wires could melt Houses and cars can catch on fire

Question 28

Ionic solution of copper (II) chloride

Answer 28

water molecules copper ions (positively charged) chlorine ions (negatively charged)

Question 29

An ionic solution

Answer 29

A solution of water with positively and negatively charged particles

Question 30

Anode

Answer 30

- An electrode - Conducting material connected to the positive terminal - Positively charged

Question 31

Cathode

Answer 31

- An electrode - Conducting material connected to the negative terminal - Negatively charged

Question 32

Electrodes

Answer 32

Conducting material connected to terminals of a battery or cell

Question 33

Electrolysis

Answer 33

Chemical reaction Compounds can be broken down into elements

Question 34

Products of the electrolysis of water

Answer 34

Hydrogen gas bubbles at cathode Oxygen gas bubbles at anode

Question 35

Fuse

Answer 35

- A device used to protect electrical components - A piece of metal that melts when overheated - Thus breaking if the circuit is overloaded

Question 36

Making a stronger electromagnet

Answer 36

Wrapping more wire around the nail Increasing voltage of cell Adding more cells

Question 37

A device used to find out the direction of a magnetic field

Answer 37

Compass

Question 38

Labels for 1-3

Answer 38

1. A cell 2. A light bulb 3. Conducting wires

Question 39

Visible components

Answer 39

Cell Conducting wires Switch Light bulb

Question 40

The picture representing system that transfers electrical energy

Answer 40

A - the torch It has a battery, wires and bulb that form an electrical circuit

Question 41

Differences between A and B

Answer 41

A: bulb not lit B: bulb lit A: no electric current in conducting wires B: electric current in conducting wires A: switch open B: switch closed

Question 42

Components

Answer 42

A: A cell B: A battery

Question 43

Magnetic field indicated by

Answer 43

Iron filings scattered in a circular/concentric pattern around a conducting wire

Question 44

Answer 44

Compasses indicating a magnetic field and its direction around a conducting wire

Question 45

Image showing

Answer 45

An electromagnet Used to separate metals Controlled by a switch For sorting recyclable materials

Question 46

Image showing

Answer 46

Electrolysis of water Using pencils as electrodes Two cells making up the battery Crocodile clips as conducting wires

Question 47

Answer 47

Two fuzes

Question 48

With these materials and equipments you could make and demonstrate

Answer 48

An electromagnet