Chapter 9 Flashcards
What do cells store
Cells store chemical energy that can be changed to electrical energy in a circuit
What does a battery contain
A battery contains two or more cells joined together
The cell in a circuit has two connections called?
terminals
What symbols are terminals labelled with
+ and - symbols
When connected into a circuit, what does the negative terminal of a cell, battery or power supply do?
The negative terminal of a cell, battery or power supply pushes electrons around in the wires
Are electrons smaller than atoms?
yes
The flow of electrons in the circuit is called what?
current
Electrons have what type of charge?
negative charge
Opposite charges___
attract
Like/ Same charges___
repel
positive and negative attract or repel?
attract
positive and positive repel or attract?
repel
negative and negative repel or attract?
repel
What is the function of an ammeter
measures the current in the circuit
What is the function of a cell
provides energy to make current flow
What is the function of a lamp
gives out light
What is the function of an opened switch
stops the flow of current when opened
What is the function of a closed switch
starts the flow of current when closed
What is the function of a buzzer
making a buzz sound
draw the symbol of an ammeter
pg 300
draw the symbol of a cell
pg 300
draw the symbol of a lamp
pg 300
draw the symbol of an opened switch
pg 300
draw the symbol of a closed switch
pg 300
draw the symbol of a buzzer
pg 300
What are the purpose for circuit symbols
there is no confusion
In the circuit symbol for a cell, which is the positive and which is the negative line
The positive is the longer of the two lines and the negative is the shorter line
In the circuit symbol for a cell,which side is the negative line(short one) and which side is the positive line(long one) at?
Negative short line is on the left while Positive long line is on the right with space between them.
Draw a diagram with a switch, cell and buzzer
pg 301
What can a circuit containing a cell, a switch and a buzzer be used for?
Doorbell. If the switch is pushed outside a door, it can make the buzzer sound and attract attention inside.
Draw a circuit diagram that contains a cell, a switch, a lamp and an ammeter
pg 301
How can an ammeter help by measuring the current?
You could tell if the cell needs to be replaced, a smaller current means the cell is low on energy
When electrons move more quickly, the current_____
increases
When electrons move more slowly, the current_____
decreases
Current is measured in units called_____
amps
Amps have the symbol___
A
Do ammeters have 2 terminals?
yes
What colours are the 2 terminals of an ammeter
one is red and the other is black
In a circuit, the red terminal of the ammeter must be connected to the __________
positive terminal of the power supply
What are electrical conductors?
Conductors are materials that conduct electricity
can electric current flow through conductors?
yes
What are electrical insulators
materials that do not allow current to flow through
does adding or removing components affect the current of the circuit?
Yes, depending on what components are changed
Does increasing the cell in an circuit increase the current? (doubling it)
yes
Current is the same at all positions in a series circuit, true or false?
True
The circuit with two lamps transfer twice as much energy as the circuit with one lamp. The lamps will be ____
dimmer
What does the term dimmer mean?
That means they do not shine as brightly.
Does increasing the lamp make the electrons move slowly? (halved aswell)
Yes
