# An experiment on the variables and constants of the capacitor

The friendliest, high quality science and math community on the planet!  One terminal of each capacitor should be marked with a definite polarity sign. Usually, capacitors of the size specified to have a negative - marking or series of negative markings pointing toward the negative terminal.

Failure to heed proper polarity will almost surely result in capacitor failure, even with a source voltage as low as 6 volts. When electrolytic capacitors fail, they typically explode, spewing caustic chemicals and emitting foul odors. Please, try to avoid this! Notice how it increases slowly over time, rather than suddenly as would be the case with a resistor.

This is the amount of time it takes for the capacitor voltage to increase approximately It is educational to plot the voltage of a charging capacitor over time on a sheet of graph paper, to see how the inverse exponential curve develops.

In order to plot the action of this circuit, though, we must find a way of slowing it down. Given a pair of identical resistors and a pair of identical capacitors, experiment with various series and parallel combinations to obtain the slowest charging action.

You should already know by now how multiple resistors need to be connected to form a greater total resistance, but what about capacitors? This circuit will demonstrate to you how capacitance changes with series and parallel capacitor connections. Just be sure that you insert the capacitor s in the proper direction: The discharging circuit provides the same kind of changing capacitor voltage, except this time the voltage jumps to full battery voltage when the switch closes and slowly falls when the switch is opened.

Netlist make a text file containing the following text, verbatim:Introduction to the constants for nonexperts. a fundamental constant experiment of current interest is also described: the determination of the fine-structure constant by means of the quantum Hall effect and calculable cross capacitor.

E and m are variables and c is invariant, a constant of the equation. In quantum theory, the. In this experiment a (computer-emulated) oscilloscope will be used to monitor the potential difference, and thus, indirectly, the charge on a capacitor.

The voltage measurements will be used in two different ways to compute the time constant of the circuit.

## Introduction

Introduction to the constants for nonexperts. a fundamental constant experiment of current interest is also described: the determination of the fine-structure constant by means of the quantum Hall effect and calculable cross capacitor. E and m are variables and c is invariant, a constant of the equation. In quantum theory, the.

## Discussion of Principles

Student experiment: Varying R and C The previous experiment produced graphs of the discharge for a particular combination of resistor and capacitor. This can be extended by looking at the decay for a range of values of C and R. Goal of this experiment A capacitor is charged and discharged through a resistor R.

Voltage across the capacitor and the current through the resistor are monitored as function of time for two di erent RCtime constants. After a period equivalent to 4 time constants, (4T) the capacitor in this RC charging circuit is virtually fully charged and the voltage across the capacitor is now approx 98% of its maximum value, Vs.

Episode Discharge of a capacitor