Electronics
Lesson 3
Resistors
START
SECTION 01
Resistors in series
SECTION 01
What happens if...
You increase the amount of resistance in a circuit?
Resistance increases, bulbs dim
SECTION 01
What happens if...
You increase the amount of resistance in a circuit?
Increasing the value of a resistor has the same effect.
SECTION 01
Total resistance
In SERIES, the total resistance is given by the sum of the individual resistances.
How could we say this using maths?
Rtotal = R1 + R2 + R3
Questions
SECTION 01
What happens to the voltage?
- If the resistors are in series, the amount of resistance felt by the charges moving through the circuit increases.
- This causes more energy to be dissipated and the voltage drops.
- How can you relate this to Ohm's law?
SECTION 01
ReMINDER: Ohm's law
What units do we measure each of these in?
- Voltage: Volts (V)
- Current: Amps (A)
- Resistance: Ohms (Ω)
Now complete section 1, questions 1-3 of the workbook.
Reminder: Connecting resistors in series using TinkerCad
DIP Support
Terminal Strips
Power Rails
Reminder: Connecting resistors in series using TinkerCad
DIP Support
Terminal Strips
Power Rails
Reminder: Connecting resistors in series using TinkerCad
Positive = red wires
Notice how we don't need a power source to emasure resistance. Can you think of why?
Negative = black wires
SECTION 02
Resistors in Parallel
SECTION 01
What happens if...
The components/resistors are connected in parallel instead?
Adding bulbs in parallel - they don't dim. Why not?
SECTION 01
Total resistance
In PARALLEL, the total resistance is given by the reciprocal of the individual resistances.
How could we say this using maths?
Rtotal = 1/R1 + 1/R2 + 1/R3
Questions
Now complete section 2, question 1 of the workbook.
Reminder: Connecting resistors in parallel using TinkerCad
Positive = red wires
What would you do if you had more resistors than rows to place them in on the top half of the breadboard?
Negative = black wires
SECTION 03
Voltage dividers
SECTION 03
What do the words "voltage divider" mean?
- What it says on the tin!
- A voltage divider "splits up" the voltage.
- In other words, it turns a large voltage into a smaller one.
We can do this with resistors in series
SECTION 03
We want to calculate Vout
- We can then determine whether we have a voltage divider.
- Why? Because it will be less than the total voltage across the whole circuit.
SECTION 03
We want to calculate Vout
Questions
First resistor value
Voltage in
Total resistance
What is the total resistance?
If these resistors were connected in parallel instead, what would their total resistance be?
True or false: When two resistors of the same value are connected in series, the total resistance is twice that of one resistor.
What is the total resistance?
What is vout?
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Transcript
Electronics
Lesson 3
Resistors
START
SECTION 01
Resistors in series
SECTION 01
What happens if...
You increase the amount of resistance in a circuit?
Resistance increases, bulbs dim
SECTION 01
What happens if...
You increase the amount of resistance in a circuit?
Increasing the value of a resistor has the same effect.
SECTION 01
Total resistance
In SERIES, the total resistance is given by the sum of the individual resistances.
How could we say this using maths?
Rtotal = R1 + R2 + R3
Questions
SECTION 01
What happens to the voltage?
SECTION 01
ReMINDER: Ohm's law
What units do we measure each of these in?
Now complete section 1, questions 1-3 of the workbook.
Reminder: Connecting resistors in series using TinkerCad
DIP Support
Terminal Strips
Power Rails
Reminder: Connecting resistors in series using TinkerCad
DIP Support
Terminal Strips
Power Rails
Reminder: Connecting resistors in series using TinkerCad
Positive = red wires
Notice how we don't need a power source to emasure resistance. Can you think of why?
Negative = black wires
SECTION 02
Resistors in Parallel
SECTION 01
What happens if...
The components/resistors are connected in parallel instead?
Adding bulbs in parallel - they don't dim. Why not?
SECTION 01
Total resistance
In PARALLEL, the total resistance is given by the reciprocal of the individual resistances.
How could we say this using maths?
Rtotal = 1/R1 + 1/R2 + 1/R3
Questions
Now complete section 2, question 1 of the workbook.
Reminder: Connecting resistors in parallel using TinkerCad
Positive = red wires
What would you do if you had more resistors than rows to place them in on the top half of the breadboard?
Negative = black wires
SECTION 03
Voltage dividers
SECTION 03
What do the words "voltage divider" mean?
We can do this with resistors in series
SECTION 03
We want to calculate Vout
SECTION 03
We want to calculate Vout
Questions
First resistor value
Voltage in
Total resistance
What is the total resistance?
If these resistors were connected in parallel instead, what would their total resistance be?
True or false: When two resistors of the same value are connected in series, the total resistance is twice that of one resistor.
What is the total resistance?
What is vout?