Capacitors Questions

• A capacitor stores electric energy in the form of an electric field.
• A capacitor can be fully charged in 4 time constants.
• The opposition to ac from a capacitor is called reluctance.
• Capacitors in parallel have a higher total value than any individual capacitor.
• In a series capacitive circuit the smallest capacitor will have the largest voltage drop across it.
• The impedance of an RC series circuit is (R2 +C2)1/2.
• The true power in an RC series circuit is PR = I2 x R.
• The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons.
• The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).
• An ohmmeter can be used to test a capacitor.
• The term "integrator" is derived from a mathematical function in trigonometry.
• This circuit is an RC integrator.
• Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates.
• A high-pass filter heavily attenuates the higher frequencies.
• Capacitive reactance is inversely proportional with frequency.
• The impedance in an RC parallel circuit is
• The frequency response curve illustrates that as the frequency of the input increases, the voltage of the output will decrease.
• Ceramic capacitors have higher voltage ratings than electrolytic capacitors.
• This circuit is a low-pass filter.
• Between any two time constants, the charge on a capacitor changes about 63%.