Day 66: RC Circuits

Today, I introduced RC circuits by displaying the voltage across the capacitor as it charges and discharges. I share that when first-year physics students describe a graphical relationship as “exponential” they usually mean “quadratic.” Today, however, we can use that label correctly! The curve fit for an RC circuit is always fantastic.

Screen Shot 2014-11-24 at 9.58.01 AM

Unfortunately, We ran short on time today, and students don’t have a strong understanding of what the time constant really means. I won’t be in the classroom tomorrow; so, we’ll see how they do on the activity which is to determine how adding a second capacitor in series or parallel to the first affects the behavior of the RC circuit and how we can model the equivalent capacitance.

I still need to finalize the lab practicum for this unit, but I want something involving RC circuits, time constants, and flashing LEDs!


Leave a Reply