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9.3 Resistance
27 April 2023
Unit 9.3 Resistance
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Slide 1:
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Physics
Secondary Education
Age 12,13
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27 April 2023
Unit 9.3 Resistance
Slide 1 - Tekstslide
Content objectives
I can explain the effect of resistance to current in a circuit.
I can state the equation that links voltage, current, and resistance (Ohm's Law).
I can use Ohm's law to calculate resistance from voltage and current.
Slide 2 - Tekstslide
What have I learned?
Describe how current flows in a conductor.
Describe the difference between a conductor and an insulator regarding current flow.
What does the word resistance mean in everyday language?
Slide 3 - Tekstslide
Slide 4 - Video
Resistance
a measure of how easy or difficult it is for electrons to move through a material
Symbol: R
measured in units called "ohms" or Ω
Slide 5 - Tekstslide
Which of the following is a conductor?
plastic
wood
Slide 6 - Poll
Which of the following has the lowest resistance?
copper
plastic
wood
Slide 7 - Poll
Example
A 100 m length of copper can have a resistance of 0.5-1.0 Ω.
A 1-cm length of plastic can have a resistance of 1000000000000 Ω.
Slide 8 - Tekstslide
What does resistance do?
A
slows down the flow of electrons
B
makes current higher
Slide 9 - Quizvraag
Why is the wire covered with plastic?
Slide 10 - Tekstslide
Conductors in light bulbs
Some conductors are designed to have high resistance. WHY?
Slide 11 - Tekstslide
Conductors in light bulbs
Some conductors are designed to have high resistance. WHY?
filament
Slide 12 - Tekstslide
As resistance makes it difficult for current to flow ____________.
the greater the resistance in a circuit
the lesser the resistance in a circuit
Slide 13 - Poll
The greater the resistance in a circuit, the __________ the current flow
smaller
bigger
Slide 14 - Poll
low
high
easy
Slide 15 - Sleepvraag
Do this in your notebook.
Slide 16 - Tekstslide
Ohm's Law
Georg Simon Ohm
link between voltage, current, and resistance
resistance applies to many electrical components not only wires
Slide 17 - Tekstslide
Using an equation, what does Ohm's Law say?
Slide 18 - Tekstslide
Using an equation, what does Ohm's Law say?
Slide 19 - Open vraag
Resistors
a type of electrical component designed to have a known resistance
colours in these resistors for a code to show the resistance value in ohms.
Slide 20 - Tekstslide
Do this in your notebook.
Slide 21 - Tekstslide
26 April 2023
Unit 9.2 Current and Voltage in parallel circuits
Slide 22 - Tekstslide
What do I call these devices?
Slide 23 - Tekstslide
What do I call the devices shown?
Slide 24 - Open vraag
How are these devices connected in a circuit?
Ammeter -
Voltmeter -
Slide 25 - Tekstslide
Voltage in a SERIES circuit
Slide 26 - Tekstslide
Voltage in a SERIES circuit
Slide 27 - Tekstslide
Adding more components in a Series circuit
Slide 28 - Tekstslide
Adding more components in a Series circuit
Slide 29 - Tekstslide
Adding more components in a Series circuit
Slide 30 - Tekstslide
What happens to the current in a series circuit if you increase the number of cells?
A
current increases
B
current decreases
Slide 31 - Quizvraag
What happens to the voltage in a series circuit if you increase the number of cells?
A
Voltage increases across each component.
B
Voltage decreases in the battery.
Slide 32 - Quizvraag
Voltage in a PARALLEL circuit
Slide 33 - Tekstslide
What do you notice in these diagrams?
Slide 34 - Tekstslide
Adding more components in a Parallel circuit
Slide 35 - Tekstslide
Adding more components in a Parallel circuit
Slide 36 - Tekstslide
What happens to the supply voltage in a parallel circuit if you increase the number of cells?
A
supply voltage increases
B
supply voltage decreases
Slide 37 - Quizvraag
What happens to the voltage across each branch in a parallel circuit if you increase the number of cells?
A
voltage increases
B
voltage decreases
Slide 38 - Quizvraag
What happens to the current through the cell in a parallel circuit if you increase the number of cells?
A
current through the cell increases
B
current through the cell decreases
Slide 39 - Quizvraag
What happens to the current through each branch in a parallel circuit if you increase the number of cells?
A
current through each branch increases
B
current through each branch decreases
Slide 40 - Quizvraag
Practice Activity
Slide 41 - Tekstslide
voltage
parallel
series
current
Slide 42 - Sleepvraag
Classwork Activity
Slide 43 - Tekstslide
What's next?
Slide 44 - Tekstslide
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