Download Voltage/DC current

1:30: Collect homework, quickly go over it as review.
Does anyone remember the purpose of a battery?
Voltage Definition: The measurement of electrical energy.
- It is usually measured as a difference of electrical energy between two points.
- Voltage is the energy that causes the electrons to want to go to from one place to
another.
- It is measured in Volts.
- The higher the voltage, the greater the energy for the electrons to leave.
Analogy: Electric flow is similar to water flow. A waterfall, for example, provides a lot of energy
when water flows down. We would say that it has a high voltage.
- Be careful! If you use too much voltage, you might break the components!
- The voltmeter measures the drop of electric energy (Voltage) between the two points.
- Use the voltmeter to demonstrate the voltage of different batteries.
Question: Let’s look at the batteries. If we measured it, it would have a voltage of 1.5 Volts.
What happens if we connect two of them in series?
- Build a simple circuit and demonstrate the various voltage.
Question: ​What does it mean when a battery has 0 Volts?
Current Definition: Current is the flow of electrons. This electric current can have a speed.
- Current is measured in amperes
Question: ​We make two circuits. One circuit has a current of 2 amperes and the other circuit
has a current of 3 amperes. In which circuit are the electrons moving faster?
Question:​ What does it mean if we measure a circuit and the current is 0 amperes?
Question:​ If we increase the voltage, would the current speed increase or decrease?
The units = 1 Ampere = 1 Coulomb/ second = 6.24 10^18 electrons/second (quintillion)
DC current is the unidirectional flow of electricity. Think of a one way street.
Maybe teach AC later? After electromagnetism?
This has a good demonstration showing a water analogy showing AC current.
https://cdn.sparkfun.com/assets/a/0/7/b/a/522783e0757b7fc2168b4567.gif
The above gif comes from the below website.
https://learn.sparkfun.com/tutorials/alternating-current-ac-vs-direct-current-dc