Unit#5-09

Learning Outcome

At the end of this lesson, you will be able to:

• review Ohm’s law

Review

• review:

  • what is charge

  • what is a Coulomb

    • 6.242×1018  elementary charged particles 

  • what is an Amp

    • 1 A = 1 C / 1 s

  • what is a Volt

    • 1 V = 1 J / 1 C

      • Note: 1 J is a measure of energy (1 J = 1 N  ⋅  m )
                      1 N = 1 kg ⋅ 1 m/s²

• voltage and amps

Lesson

• Ohm's Law

  • states:

    • I = V / R or
      V = I ⋅ R or
      R = V / I

• the water analogy is:

  • the pressure of a water hose is proportional to the amount of water flowing through and the size of the hose

• a battery has a pre-defined Voltage (it can only push so much)

  • therefore if you increase the resistance, then less current will flow

Activity

• nil

Daily Assignment

• complete the attached worksheet