In Chapter 3, we learned about current, which is the rate of flow of charge. In this chapter, we are going to learn about two other fundamental electrical quantities—voltage and resistance. These two quantities are the ones that are usually the most critical to building effective circuits.
Current is important because limiting current allows us to preserve battery life and protect precision components. Voltage, however, is usually the quantity that has to be present to do any work within a circuit.
4.1 Picturing Voltage
What is voltage? Voltage is the amount of power each coulomb of ...
