Exercise nine, “**Time and Capacitors**”. This exercise demonstrates how one can measure time by simply placing a capacitor in series with a resistor. The importance of this concept is related to the “**time constant**”. That said, by placing a capacitor and resistor in series, the amount of time it takes for the capacitor to charge will be much longer than if both components were placed in parallel.

To fully implement this exercise you will need a multimeter. I would suggest getting some alligator leads instead of using the traditional probes as it makes for easier measuring.

Upon observation, you should notice that the 100K resistor causes the capacitor to charge much slower compared to the 100 ohm resistor when added to the circuit. In going back to the “time constant” or TC as it’s known; **TC = R x C**. In this formula **TC** is the time constant and a Capacitor **C** is being charged through resistor of **R** ohms. The author does an excellent job of walking the reader through the time constant theory in this chapter.

As for the construction of the circuit, it’s straight forward and is simple to bread board. The main take-away from this exercise is obviously the concept of time. Apply your focus to the theory and circuit observation via the multimeter results.

Lastly, I also simulated the circuit. See attached video below. When applicable I will attempt to simulate the circuits to demonstrate how they perform in simulation prior to rendering them via hardware.[wpvideo b4v30Uhj]

**Required Components:**

-AC Adapter, breadboard, wire, wire cutters, and strippers

-Multimeter

-Push-button SPST

-Resistors and Capacitors

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