Identify the basic units of capacitance Identify different types of capacitors

# Identify the basic units of capacitance identify

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Identify the basic units of capacitance Identify different types of capacitors Determine total capacitance in series and parallel circuits Explain RC time constants and how they relate to capacitance
Capacitance Capacitance Ability to store electrical energy in an electrostatic field Basic unit is the farad (F) Represented by letter C Capacitor Possesses a specific amount of capacitance Either fixed or variable
Capacitors Factors that affect capacitance Area of the plate Distance between the plates Type of dielectric material Temperature Figure 11-1. A capacitor consists of two plates (conductors) separated by a dielectric (insulator or nonconductor).
Note Capacitor fully charge act as energy source Donot touch with bare hands shorting their leads to discharge the touch In DC circuits act as an open circuit at initial charge ,as have infinite resistance.
Capacitance (cont’d.) Fig 11-3. Electrolytic capacitors. Fig 11-4. Paper and plastic capacitors.
Capacitors (cont’d.) Fig 11-5. Ceramic disk capacitors. Fig 11-6. Variable capacitors.
Capacitors (cont’d.) Total capacitance in series circuits: Total capacitance in parallel circuits:
RC Time Constants Figure 11-7. Circuit used to determine RC time constant. RC circuit time constant formula: t = RC where: t = time in seconds R = resistance in ohms C = capacitance in farads
Summary Capacitance ( C ) allows for the storage of energy in an electrostatic field The unit of capacitance is the farad (F) Capacitor types include: electrolytic, paper, plastic, ceramic, and variable Total capacitance in series circuits:
Summary (cont’d.) Total capacitance in parallel circuits: RC circuit time constant formula: t = RC It takes five constants to fully charge and discharge a capacitor

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