Capacitor Review

1
Capacitor Review

• A capacitor stores electrical energy in the form
  of a(n) __________field.
• A capacitor will not hold a charge forever
  because of the __________ resistance of the
  dielectric or insulator material.
• As a capacitor is being charged, the current
  flowing into the capacitor will _______ in value.
• As a capacitor is being charged, the voltage
  across its terminals will ___________ in value.
• A DC circuit consists of a capacitor and a
  resistor in series connected to a voltage source.
  If thevoltage across the capacitor is zero,
  then the capacitor is __________.
• If a capacitor is discharging through a load,
  then the voltage across its terminals will
  _________.

2
Capacitor Review-2

• Three capacitors with values of 10 uF, 40 uF, and
  50 uF are connected in parallel. What is the
  total capacitance in this circuit?
• Three capacitors with values of 30 uF, 30 uF, and
  30 uF are connected in series. What is the total
  capacitance in this circuit?
• When unequal valued capacitors are placed in a
  series DC circuit, the ______ valued capacitor
  will have the highest voltage drop on it.
• A capacitor will charge to _______ percent of its
  maximum value in five time constants.
• When voltage is first applied to a capacitor in a
  DC circuit, the capacitor acts as a _____-circuit
  to the source.

3
Capacitor Review-3

• The opposition to the flow of current in a purely
  capacitive AC circuit is known as ____________.
• In a DC resistor-capacitor circuit, the initial
  voltage on the capacitor is at __________ while
  the current in circuit is at maximum.
• The unit of capacitance is called the _______ and
  means one coulomb of charge per volt.
• If there is no ____________ in a circuit a
  capacitor will charge up instantaneously in a DC
  circuit.
• The space between the plates of a capacitor is
  called the ____________ and is generally a good
  insulator.
• What is the formula for finding the total
  capacitance in a simple series circuit?
• If a 2MW resistor is connected in series with a 2
  uF capacitor, what is the time constant?

4
Capacitor Review-4

• When the voltage applied to a capacitor is
  greater than the dielectric strength, the
  capacitor's dielectric will become _________.
• At what number of time constants is a capacitor
  fully charged?
• When using this formula, C .225 kA / d, what is
  the unit of this formula is deriving?
• Increasing the area of the plates causes an
  __________ in the capacitance of a capacitor.
• When a capacitance of a capacitor rises with an
  increase of temperature it is said to have a
  ________ temperature coefficient.

5
Capacitor Review-5

• When checked with an ohmmeter, a good capacitor
  will show a charging current and then the
  ohmmeter reading steadies at the ___________
  resistance.
• The ratio of the charge stored in different
  insulators to the charge stored in air is called
  the __________ constant.
• If the frequency applied to a capacitor is
  tripled the capacitive reactance will be
  __________ of the original reactance.
• A capacitor that is marked "___" means that
  temperature has no effect on the capacitance of
  the capacitor.
• If a capacitor labeled as 950, the value of this
  capacitor is __________.

6
Capacitor Review-6

• A capacitor will block ______ current and will
  pass high frequency ____ current.
• The time constant is found by multiplying the
  _______ times the _________ and is measured in
  seconds.
• Capacitance decreases when the distance between
  the plates becomes ________.
• Voltage and current in a RC-AC circuit are ___
  degrees out of phase and current _____ the
  voltage.
• A ______ AC frequency will pass through a
  capacitor circuit easier than a lower frequency
  signal.
• ________ capacitors can provide high values of
  capacitance, have a very large dielectric
  strength, and can have a very large amount of
  leakage current through dielectric.

7
Capacitor Review-7

• Electrolytic capacitors due to their polarity can
  only be used in ________ current circuits.
• _______ capacitors will exploded when the
  polarity is not observed due to the formation of
  carbon dioxide gas within the capacitor.
• At the end of ___ time constants, the DC voltage
  on a the capacitor is about equal to the source
  voltage of the circuit.
• All capacitors have a working voltage limit and
  which is based on their dielectric _______.
• What material has a value for the dielectric
  constant of one?
• The current that flows through the dielectric of
  a capacitor is called the ________ current.