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10 12 F/m - constant called permittivity of free space High-voltage capacitorsconsist of interweavingmetal plates immersedin silicon oil. Small capacitors are constructed using ceramic materials (e.g. BaTi0 3 ), which have a high dielec- tric constant k 1 10 8 F/m . The process of charging or discharging a capacitor doesn't happen instantaneously. It takes some time. This time is determinedby the resistance in the circuit and the capacitance (Fig. 7.1).
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[PDF] relais de niveau schneider pdf
[PDF] schema electrique relais de niveau
[PDF] schéma de cablage relais de phase
[PDF] relais de niveau abb
[PDF] voltmetre serie ou derivation
[PDF] branchement amperemetre
[PDF] courbe paramétrée exercice
[PDF] points singuliers courbes paramétrées
[PDF] courbe paramétrée cours
[PDF] courbe paramétrée tracer
[PDF] courbe paramétrée symétrie
[PDF] courbes paramétrées exercices corrigés prépa
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Chapter 7
RC Circuits and The
Oscilloscope
There are two important concepts involved inthis experiment. In part A we examine an effect which occurs withits own unique clock, a clock whose basic time unit(the time con- stant, ) is determined by theelectrical characteristics of the circuit, i.e. bythe particular values of R and C. Acommon graph for many kinds of time-varyingphenomena can be produced in terms of the intervals called timeconstants. We can relate these graphs to our own time system (sec., min., hrs., etc.) byknowing how a time constant is related to the electrical characteristics of a particular circuit. In part B we see how we can use our knowledge of electricityand magnetism to create an important instrument for measuring effects which change with time. Like many modern instruments, theoscilloscope requires us to convert the effectwhich we wish to observe into a voltage. Thisis quite easy for this particular experiment,but that is not always the case. This lab consists of twoparts. Part A: RC Circuits (manual and computer-based) and part B : Oscilloscope.Objective
1. To study charging and discharging of a capacitor.
2. To perform basic electrical measurements using an oscilloscope.
Apparatus
PASCO Essential DCCircuits equipment, PASCO voltage sensor, power sup- ply, capacitors, resistors, three-pole switch, digital multimeter, lineargraph paper, digital oscilloscope, signal generator, coaxial cables, connecting wires, laptop.7.1 Introduction
A capacitor consists of two metal surfaces separated by a non-conductor. The electric charge can be stored on the metal surfaces of the capacitor. The amount ofcharge Q stored is 1Chapter 7� RC Circuitsand The Oscilloscope
proportional to the voltage V applied across the capacitor: Q CV The proportionality constant C in the above relationis the capacitance. The SI unit of capacitance is the Farad [F]. Commonly used subunits of the Farad are F = 10 6 F and pF = 10 12 F . The capacitance of acapacitor is determinedby the geometry of the conductor(s) and the material separating them. Commercial capacitors are often made by spacing two metallic foils with a sheet of paraffin-coated paper. Theselayers are then rolled into the shape of a cylinder to form a small package. For such a capacitor the capacitance is given by: C k� A d A = Surface area of themetal plate (m 2 d = separation betweenplates (m) k = dielectric constant(for paper k = 3.7) = 8 8510 12 F/m - constant called permittivity of free space High-voltage capacitorsconsist of interweavingmetal plates immersedin silicon oil. Small capacitors are constructed using ceramic materials (e.g. BaTi0 3 ), which have a high dielec- tric constant k 1 10 8 F/m . The process of charging or discharging a capacitor doesn't happen instantaneously. It takes some time. This time is determinedby the resistance in the circuit and the capacitance (Fig. 7.1).