Unit #0-10

Learning Outcome

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

• understand resistance and how it relates to V & I

Review

• what is a Coulomb

• what is an Amp

• the newton is :

  • • 1 N = 1 kg ⋅ 1 m/s²

• • OR -> a 100 g object exerts almost 1 N 

    • because a or acceleration due to gravity because of the earth is 9.8 m/s²

    • 0.100 x 9.8 ≃ 1.0 

• the Joule is:

  • • J  = N  ⋅  m

    • 1 Newton of force being exerted over 1 meter

• the Volt is:

  • • V  = J /  C

    • 1 Volt is 1 Joule of energy per Coulomb of charge

Lesson

• watch video, "What is voltage?"

• what is resistance

• what is Ohm's Law

  • 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

• watch video, "What is voltage?"

Daily Assignment

• complete worksheet