circuits and components Flashcards
Define current
The flow of electrical charge around a complete circuit per-second.
Define switch
A component that controls a current by making or breaking a circuit
Define voltemeter
A device used to measure used to measure ‘potential difference’. It is always ‘in parralel’
Define ammeter
A device used to measure electrical current in a circuit.
Define potential difference
A measure of the push of a cell or battery, or the energy a battery or cells supplies to set the electrical charge in movement.
Define cell:
A chemical store of energy that supplies energy ‘ or a push’ to the electrical charge ( electrons) to set it into motion ( movement of electrons around a complete circuit)
Define battery
Two or more electrical cells oined together
Define amps
Units of measurement of electrical current , symbol (A)
Define motor
A component or machine that spins when current flows through it.
How can you measure current
You measure current using an ammeter
What is the units of measuring current
Amps ( symbol A)
What is required for ammeters in order to be in a circuit and work.
It has to be connected to the same line, in other words it as to be ‘ IN SERIES ‘
Draw a circuit that has a
1- wire
2- cell
3- bulb
4- resistor
5- ammeter
6- voltemeter
Mark accordingly:
1- Wires have to be straight lines drawn using a ruler.
2- Cell has 2 side, long side (positive) and short side ( negative)
3- Bulb is a big circle with an x drawn on it.
4- Resistor is opposite to the cell and is a rectangle with wires connected to both sides
5- Ammeter is a circle with a capital A. It has to be in series meaning in the same line as every other component.
6-Voltemeter is a circle with a capital V. It has to be in parrallel meaning in a different line as every other component
Sorry it is complicated but i don’t know how to add the photo so I just explained how it should look like.
hehehehehe yarrrrr
fatma was here :l ^-^
What makes a battery
2 or more cells
How are wires represented in circuit diagrams
Wires are reprsesnted with straight lines
How can a battery or cell result in an incomplete circuit
Circuits are incomplete when you cannot follow the circuit from one end of the battery, through the different components, to the other end of the battery. If the circuit is incomplete, it won’t work.
Draw each of the following
1- open switch
2- closed switch
lamp
resister
cell
motor
wire
buzzer
ammeter
battery
voltemeter
( check powerpoint)
How can you decrease resistance
add an extra branch to the circuit
What happens to the current and resistance when you add components
Adding components gives more places for current to flow, increasing the total current, and decreasing the total resistance.
What happens to p.d and current is series circuit
Current: same
P.d: Different
What happens to p.d and current is parallel circuit
Current: different
P.d: same
Draw an example of series circuit
All the components are connected to one wire ( one line)
How does analogies and models help us
Models and analogies help us to think about electric currents in different ways. They help us to “picture” what is going on inside e.g. wires, bulbs and cells/batteries.
draw 2 examples of a parallel circuit.
One with a voltemeter and one without
2 or more branches, not the same line. Voltemeter in a different line
Which side of the battery is positive and which side is negative
the positive side of the battery is the longer side and the negative side is the shorter side
True or false:
Battery produces the charge
False. the charge in already in the wire. The battery just provides in with energy to set the charge in motion
Draw a battery
It is supposed to be long line,short line, long line then short line.
Not long line, short line,short line, long line
How can a closed switch result in an incomplete circuit
You need to close the gap and make a complete circuit for a current to flow.
What are electrical wires usually made of and why
made of metals typically copper because they good insulators of electricity .
What happens if a circuit is incomplete?
The flow of charge won’t go through every component and go from one end of the battery to another therefore the reciever won’t work.
Fill in the blanks:
https://docs.google.com/document/d/101SXy55cx9yojDi65ff_5dqdAGNg4cxNvC5mfkwXbxs/edit
Answers on the second page
(b) Which part of the circuit supplies the energy?
battery/cell
what does a circuit need and give examples
Electrical source: Battery/cells
Electrical receiver: Bulb, motor, buzzer
Electrical components Wires, switch
What are electrcial conductors and give examples of good electrical conductors
They let electricity pass through them easily. <any metals such as copper,iron and steel are good electrical conductors.
what are electrical insulator and give examples
Materials that don’t allow electricity to pass through them such as rubber,plastic and wood.
why are electrical insulator used to cover up the wire
prevent you from getting an electric shock
