Basic Electrical Theory Flashcards
What direction does current flow in
Positive to negative
What is current defined as
The rate of change of charge
What is voltage defined as
The potential difference between 2 points
How to resistors dissipate energy
Heat
What separated the plates in a capacitor
a Dilectric
what is the equation for capacitance
i=c*dv/dt
What cannot change instaneously in a capacitor
The voltage
How much current passes through a capacitor at DC and what does it behave as in this case
no current and an open circuit
What does a capacitor do with energy
stores and releases but does not dissipate
What is the equation for an inductor
v=L*di/dt
what happens to inductor at steady state dc
v=0 and it acts as a short circuit
Does an inductor pass a constant or variable current
Constant with no voltage drop
What cannot change instantaneously in an inductor
Current
When VL increases (as switch is opened) in an inductive circuit what happens and why
A spark forms across switch to allow current to flow
Is power being stored positive or negative
Positive
Is power being released positive or negative
Negative
What can Inductors and Capacitors do to energy
Store and release but not dissipate
How should a resistor be connected with a capacitor
In series on the other side of the switch
Can you open the switch when current is flowing through inductor
No as the current through an inductor cannot change instantaneously
