capacitor charging and discharging pdf

Capacitor Charging And Discharging Pdf

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Objective :. The objective of this experiment is to verify the exponential behavior of capacitors during charging and discharging processes.

Large-value capacitors are required for this experiment to produce time constants slow enough to track with a voltmeter and stopwatch. 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.

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Charging and Discharging a Capacitor

Objective :. The objective of this experiment is to verify the exponential behavior of capacitors during charging and discharging processes. Equipment :. A capacitor, a resistance box, 2 multi-meters, connecting wires, a watch, a dc power source, and a 2-way switch. Theory :. A capacitor is a passive electric device that stores electric energy.

A parallel-plates capacitor is made of two parallel metallic surfaces, each of area A , separated by an insulation layer of thickness d , and it has a capacity of. Figure 1. As soon as the key in the circuit is closed, electrons flow from the negative pole of the battery toward the lower plate of the capacitor.

They distribute over the lower plate, making it negative. At the same time, the repelled free electrons of the upper plate flow toward the positive pole of the battery. This causes the upper plate to become positively charged. This process does not happen suddenly.

It takes some time. The current is greatest to begin with, and decreases as charges accumulate on the plates. At the beginning the capacitor is empty ; therefore , the voltage across it is zero, but as more and more charges build up on its plates, its voltage keeps increasing.

Battery in Circuit. These exponential variations will be observed in this experiment. Procedure :. Arrange a circuit as shown :.

Figure 2. Obtaining 10 to 15 points for each of current and voltage is sufficient. The data may be exchanged between the experimenters afterwards. Do not disconnect the circuit. This is because while preparation is underway for the discharging part of the experiment, the capacitor voltage keeps increasing asymptotically toward the battery voltage.

Figure 3. Graphs :. To understand why, let us consider the equation of I C t for the charging process :. Data :. Given :. Use other values if suggested by your instructor. Capacitor Charging:. Capacitor Discharging:. Calculations :. Comparison of the Results :.

The other four graphs may be compared with the corresponding graphs in your physics book. Charging Battery in Circuit.

Capacitor Charging and Discharging

JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Principle The students know that the electrical component "capacitor" can store electrical energy. The first experiment concentrates on the change in the capacitor voltage over time during charging and discharging. Qualitative statements are first derived, then the change in the voltage during charging and discharging is quantitatively determined.


Capacitors are physical devices; capacitance is a property of devices. Charging and Discharging. In a simple RC circuit4, a resistor and a capacitor are connected.


Charging and discharging of a capacitor pdf Dhahran

A Capacitor is a passive device that stores energy in its Electric Field and returns energy to the circuit whenever required. Figure 1 and Figure 2 are the basic structure and the schematic symbol of the Capacitor respectively. When a Capacitor is connected to a circuit with Direct Current DC source, two processes, which are called "charging" and "discharging" the Capacitor, will happen in specific conditions. Both Plates get the equal and opposite charges and an increasing Potential Difference, v c , is created while the Capacitor is charging. The Voltage v c on a Capacitor cannot change abruptly.

High Speed Pulse Technology, Volume III: Capacitor Discharge Engineering covers the production and practical application of capacitor dischargers for the generation and utilization of high speed pulsed of energy in different forms. This nine-chapter volume discusses the principles of electric current, voltage, X-rays, gamma rays, heat, beams of electrons, neutrons and ions, magnetic fields, sound, and shock waves in gases and liquids. Considerable chapters consider the applications of capacitor discharges, such as impulse hardening of steel, ultrapulse welding of precision parts, X-ray flash technology, ultrafast image converters, exploding wire shutters and light sources, electromagnetic shutters, flash photolysis, and spark tracing in aerodynamic and automotive research. The remaining chapters explore other practical aspects, including high energy electromagnetic pulse generation, plasma physics, magnet charging, magnetically driven gas and particle accelerators, acoustic echo techniques for remote atmospheric sensing, sonar, and shock waves in high pressure physics and metal forming.

The charging and discharging of a capacitor. PDF The beauty of a diode lies in its voltage-dependent nonlinear resistance. The voltage on a charging and discharging capacitor through a reverse-biased diode is calculated from basic equations and is found to be in good agreement with experimental measurements. Instead of the Charging: When a capacitor is connected to the DC supply and current starts to flow through the circuit both plates of the capacitor gets the equal and opposite charges and an increasing potential difference which is created while the capacitor is charging..

The charge and discharge of a capacitor

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2 comments

Rafel L.

It is important to study what happens while a capacitor is charging and discharging.

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Mandy E.

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