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Theory 5 House

QuestionAnswer
What is a dielectric? A dielectric is an insulating material between the plates
List three (3) factors that determine the capacitance of a capacitor 1. The area of the plates 2. The distance between the plates 3. The type of dielectric used
In what form is the energy of a capacitor stored? electrostatic field
In a purely capacitive circuit, the current _____ (hint: leads or lags) the applied voltage by ___ degrees. leads, 90
In a purely capacitive circuit, __ % of the power is reactive power. 100
Dielectric stress is the stretching of ______ in the dielectric material between the plates of a capacitor. electron orbits
A capacitor and a resistor’s power are _____ degrees out of phase with each other 90
Aluminum can not be used as a dielectric material because it would allow electrons to flow directly from one plate to the other plate within the capacitor.
Capacitor’s charge at an _____ rate and are completely charged after __ time constants. exponential, 5
Capacitance reactance is measured in units of _____ and capacitance is measured in units of ________. ohms, farads
As the frequency of a circuit approaches infinity (f→∞), the capacitive reactance of the capacitor approaches ______. 0
Inductors always oppose a change in current. Capacitors always oppose a change in _________. voltage
The ______ type of electrolytic capacitor will be permanently damaged if connected to the incorrect polarity. dry
An RC circuit has a resistor and a capacitor of unknown values. The possible range of phase angles between voltage and current in this circuit is ____ degrees to __ (leading) degrees 0 - 90
When a capacitor is connected to a DC circuit (frequency = 0), the capacitor behaves like an _________. open circuit
Describe what happens in a capacitor when the applied voltage exceeds the rated voltage of the capacitor? The insulation material begins to break down. Current flows across the insulation barrier. This causes a short circuit between the two plates. large amounts of heat is produced. The heat will cause pressure until the capacitor explodes.
Created by: jairoandres90
 

 



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