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10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
10 capacitors
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10 capacitors

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  • 1. Capacitance/Capacitors
  • 2. Capacitance
    Capacitance is the ability of a dielectric (insulator) to store an electrical charge
    Charge = Coulomb = Q = 6.25 X 1018 electrons
  • 3. Capacitors
    A capacitor is a component that stores electrical charge
    Schematic
    Make up of a capacitor
    The unit of measurement for capacitance is the Farad
    +
    -
    Non-Polarity Sensitive
    Polarity Sensitive
    2 Conducting
    Plates
    Dielectric (Insulator)
    Note to teacher: charge up a 470 µF cap to 30v and then discharge
  • 4. Farad
    1 Farad: when 1 coulomb is stored in a dielectric with a potential of 1 volt
    1 Farad is a very large value
    Typical values of capacitance are in:
    microfarads (μF) (10-6)
    picofarads (pF) (10-12)
    Higher farad value = more stored charge
    Note: Charge up 470 μF and 1000 μF to show difference
    Q
    C=
    V
    Coulomb
    Farad=
    Volt
    1 Volt
    1 coulomb
  • 5. How Capacitors Work
    Charging
    Storing a charge
    Discharge
    http://micro.magnet.fsu.edu/electromag/java/capacitor/index.html
  • 6. Factors affecting Capacitance: The ability of a capacitor to store electrical charge (capacitance size) depends upon
    Size (surface area) of the plates
    Larger plate area = more capacitance
    Distance between the plates
    Capacitance increases as the width decreases
    Dielectric Material
    Air = 1
    Paper = 2-6
    Ceramics = 80 – 1200
    Mica = 3-8
    Mylar = 2-3
    Electrolytic = 7
    http://micro.magnet.fsu.edu/electromag/java/capacitance/index.html
    200 μF
    100 μF
    200 μF
    100 μF
  • 7. Three Important Facts When Choosing a Capacitor
    Capacitance Value
    Voltage Rating
    Polarity
  • 8. Capacitance Value
    Rules of thumb (as in 99% of the time)
    MF or mF on an old capacitor = µF .
    If a capacitor has a value of 1 µF or more it is usually an electrolytic (canister) capacitor. Conversely, if the capacitance value is less than 1 µF it is usually a disc or chicklet variety.
  • 9. .047 k
    .1 Z
    Capacitance Values of Disc Capacitors
    The value of the disc capacitors is usually given in one of two methods.
    The capacitance value is sometimes printed on the face of the disc capacitor like the following. If this is done then the value of the capacitance is given in micro farads (µF).
  • 10. Capacitance Values of Disc Capacitors
    The capacitance value is sometimes printed in code on the face of the disc as shown below.
    If this is the case then the capacitance value is given in picofarads (pF). The code given is the same as the code used to determine resistor values. For example: 102 would represent
    1= 1st digit of value,
    0 = 2nd digit of value,
    2= multiplier (how many zeros)
    Therefore 102 = 1000 picofarads (pF) or .001 micro farads (µF)
  • 11. Capacitors in Series and Parallel
    Capacitors in Series
    Capacitors in Parallel
    In series the width of the dielectric is additive
    10 μF
    10 μF
    CT = 5 μF
    Notice that they are exactly opposite of resistors!!!!!!!!
    10 μF
    10 μF
    CT = 20 μF
    In parallel the plate surface area is additive
  • 12. Resistor/Capacitor Time Constants

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