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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