They are electric devices, which have the ability to store electric energy. Parallel-plate capacitor is made from two parallel surfaces that conduct (Kaiser). The plates are of area A, and distance d, apart. Then capacitance of such a…
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At the same time that happens, the upper plate receives electrons making it of a positive charge (Platt). This process is not instantaneous; it takes time. At the beginning, current is high and begins to decrease as charge accumulates on the plates. At the beginning there is no voltage across capacitor but increases as charging continuous. capacitor voltage Vc, increases towards Vb but asymptotically. During the charging and discharging process, exponential laws as below are adhered to
Using the requirements provided the circuit was connected as shown above using a 470µF and 80,000Ὠ resistor. Measurements using the multi-meter was taken for time intervals of 10seconds. The results of Vc, Vemf-Vc, Ln(Vemf – Vc/Vemf) were recorded in a table 1.
At this moment the capacitor was fully charged. The value of voltage across V0 was recorded. The second part of the experiment began by undoing the switch from each procedure above and the timing process was done and table 2 was filled with relevant data Vc, Ln(Vc/V0), and time in table 2.
Logger pro was opened and voltage adjusted to zero. Time constant was set to 150seconds. Capacitor was recharged holding the voltage probe across capacitor. Switch was flipped to B and hit collect on logger pro. Natural exponent function was selected on the logger pro. Data obtained was then recorded.
The practical objective were met and the practical was successful. Data used for calculation was obtained from finding the average of the data obtained from trials 1 and 2. When a capacitor is connected to a battery, it charges and the rate at which it happens is dependent on the time constant. By opening the switch, the capacitor discharges. The theoretical value of the time constant differ from the practical value obtained after plotting the graph, finding gradient and calculating for time constant. This is due to human measurement errors, faulty components, and faulty meters.
Timing in this experiment is the
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The amount of charge increases steadily until the maximum amount of charge designed for the capacitor to store is reached. At this point (when an optimum charge has been achieved), the capacitor ceases to charge despite the increase in the voltage of the current flowing across the loop.
As per the prevailing standards most of homes around the world use 110 volt or 220 volt electrical connections. Accordingly the electrical appliances are manufactured by the industry.
iv. Watt (W): This is the unit of power or energy. One unit of power is i.e.
These are negative also referred to as inverse or degenerative feedback and the positive also referred to as direct or regenerative feedback. The different between the two types of feedback is basically on whether the
Sue Holtand John Miller, and the MIT Open-source website (http://ocw.mit.edu/high-school/physics/demonstrations-on-video/conductors-capacitors-dielectrics/).
According to Advanced Physics for You by Keith Johnson, Simmone Hewett, Sue Holt and John Miller, the approach of
It was because they were in a series connection where they share voltage equally. Circuit 2 had the same voltage through all the resistors because they were connected parallel to each other. Circuit 3 had equal voltage in
The paper seeks to evaluate the methods that can be used to design, implement and test a timer for ABC Ltd that has requested for a quotation for an electronic timer required for controlling its chemical processes. In order to carry out this