Search

The experiment in charging and discharging of a capacitor through a resistor is fundamentally important for studying electronics. We have developed an alternative procedure to measure the voltage drops across capacitors as a function of time. The simple apparatus controlled by an Arduino Uno microcontroller board and LabVIEW™ interface was set up. Charging and discharging data were fitted by using exponential linear and associating functions. We found that in series circuit, the sum of individual voltage drops in each capacitor was equal to the supplied voltage. Meanwhile in parallel circuit, the voltage drop was found to be equal to the supplied voltage. In this study, the time constant is less than 2% compared to that of in theory.

The teaching of wave physics has developed over the years, including devices that demonstrate water waves being used effectively for a long time. However, it was not easy to select and display the wave frequencies. This research had developed a DIY Ripple Tank experiment set using a smartphone application to measure the properties of water waves. The vibrations of the source characterized by points and bars with a speaker and a small amplifier (model GF1002) connecting to the source with a wave ball displayed on the screen. The apparatus controlled the wave source by adjusting the frequency ranging from 10-30 Hertz via the PhyPhox application on a smartphone. Waves then were created in two types of liquid: water and a salt solution. Images of waves appearing on the receiver were adjusted to a standstill by the Strobe Light Tachometer application on the smartphone which allows us to adjust flashing light frequencies to match the frequency of the wave and the frequency of the sound source. As a result, we found that this research shows the relationship according to the equation of speed of a sinusoidal wave at different viscosity coefficients of the liquid. The speed of the wave in water and salt solution were found to be 0.079 ± 0.003 m s[superscript -1] and 0.074 ± 0.005 m s[superscript -1] , respectively. This research can be applied in school as a demonstration showing that physics of the wave is easy and interesting.

The purpose of this study was to develop a modern experimental apparatus using an Arduino with LabVIEW instead of the classical experiment. The wavelength of the sound was determined using the resonance of an air column. The smartphone app was used to generate the desired frequencies. A sound intensity and ultrasonic sensor was used to read the data of sound intensity and distance. The Arduino board using LabVIEW LINX firmware was used as an interface. The resonance frequency for each harmonic series in the pipe (closed at one end) was shown on the laptop. The speed of sound in air was determined and the result was in a good agreement with the theory and experiment.

The experiment in charging and discharging of a capacitor through a resistor is fundamentally important for studying electronics. We have developed an alternative procedure to measure the voltage drops across capacitors as a function of time. The simple apparatus controlled by an Arduino Uno microcontroller board and LabVIEW™ interface was set up. Charging and discharging data were fitted by using exponential linear and associating functions. We found that in series circuit, the sum of individual voltage drops in each capacitor was equal to the supplied voltage. Meanwhile in parallel circuit, the voltage drop was found to be equal to the supplied voltage. In this study, the time constant is less than 2% compared to that of in theory. [ABSTRACT FROM AUTHOR]