Lesson: Capacitor Charging and DischargingPhysics
In this lesson, we will learn how to describe exponential changes with time in capacitive circuits, knowing that such changes depend on a circuit’s time constant.
Sample Question Videos
A 500 Ω resistor, an uncharged 1.50 µF capacitor, and a source with a 6.16 V emf are connected in series.
What is the initial current?
What is the RC time constant?
What is the current after one time constant?
What is the voltage on the capacitor after one time constant?
The timing device in an automobile’s intermittent wiper system is based on an RC time constant and utilizes a 0.500 µF capacitor and a variable resistor. Over what range must be made to vary to achieve time constants from 2.00 s to 15.0 s?
If you wish to take a picture of a bullet traveling at 500 m/s, then a very brief flash of light produced by an RC discharge through a flash tube can limit blurring. Assuming 1.00 mm of motion during one RC constant is acceptable, and given that the flash is driven by a 600- capacitor, what is the resistance in the flash tube?