Lesson 12

  • First name: George
  • Guess his last name.
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  • First name: George
  • Guess his last name.

Slide 1 - Diapositive

  • George Ohm

  • Shared Ohm's law with the public in 1827.

  • Ohm's law is used in designing the electrical circuits in all our technology.


Slide 2 - Diapositive

Current, voltage and resistance.
  • Current: the flow of charged particles from one point in a circuit to another. Expressed in amperes (Coulomb / second)


  • Voltage: The difference in electrical potential energy between two points in a circuit. Expressed in volts (Joules / second)


  • Resistance: The opposition to the flow of charged particles. Expressed in Ohms.

Slide 3 - Diapositive

Which of these three is incorrect?
Current=voltageResistance
Current=ResistanceVoltage
Resistance=CurrentVoltage
A
B
C

Slide 4 - Diapositive

This lesson
  • Intro
  • Rearranging Ohms law
  • Discussing the homework
  • Time to study

Slide 5 - Diapositive

Learning goals
  •  You can name who discovered Ohm's law (not required for the test)

  • You can describe the relationship between current, voltage and resistance – Ohm's law.
  • You are able to Rearrange Ohm's law
  • You are able to apply Ohm's law in calculations.

Slide 6 - Diapositive

R=IV
V=IR
I=RV
Current=resistancevoltage
Voltage=currenresistance
Resistance=currentVoltage
Rearrange the formula
In words
In symbols

Slide 7 - Diapositive

R=IV
V=IR
I=RV
Current=resistancevoltage
Voltage=currenresistance
Resistance=currentVoltage
Rearrange the formula
In words
In symbols

Slide 8 - Diapositive

R=IV
V=IR
I=RV
Current=resistancevoltage
Voltage=currenresistance
Resistance=currentVoltage
Rearrange the formula
In words
In symbols

Slide 9 - Diapositive

R=IV
V=IR
I=RV
Current=resistancevoltage
Voltage=currentresistance
Resistance=currentVoltage
Rearrange the formula
In words
In symbols

Slide 10 - Diapositive

R=IV
V=IR
I=RV
Current=resistancevoltage
Voltage=currenresistance
Resistance=currentVoltage
Rearrange the formula
In words
In symbols

Slide 11 - Diapositive

Discussing the homework

Slide 12 - Diapositive

3 lamps are connected to a battery in a parallel circuit. The battery supplies the circuit with 2.4 Ampere. 

Because of its resistance, the second lamp gets 2/3 of the current supplied to the circuit. The rest of the current gets divided evenly over the other two lamps. 

The voltage over the battery is 6 Volts.

Calculate the resistance of each lamp.

Slide 13 - Diapositive

Learning goals
  •  You can name who discovered Ohm's law (not required for the test)

  • You can describe the relationship between current, voltage and resistance – Ohm's law.
  • You are able to Rearrange Ohm's law
  • You are able to apply Ohm's law in calculations.

Slide 14 - Diapositive