A+B Flashcards
A1
Wheat constitutes a capacitor
Two conductors separated by an insulator
A2
What is,the purpose of a capasitor
It stores electric energy in electro static fields.
A3
Does a capacitor in an AC circuit cause the current to lead or lag the voltage?
It causes the current to lead the voltage.
A4
What is the basic unit of capacitance
The farad
A5
In an AC circuitWhy should electrolytic capacitors not be used in an AC circuit?
They are polarized, an electrolytic capacitor will allow current of one polarity and block the opposite polarity.
B1
What is meant by inductance?
The ability to store electricity in electromagnetic fields.
B2
What is the basic unit of inductance?
The Henry.
B3
What is an example of an inductor used in a magneto?
The coil.
B4
Does an inductor in an AC circuit cause the current to lead or lag the voltage?
It causes the current to lag behind the voltage.
B5
How can you find d the polarity of an electro magnet
Hold the magnet in your left hand with your fingers encircling the coil in the direction electrons flow (from negative to positive). Your thumb will point to the north[one of the electromagnet.
B6
What is meant by impedance
The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance, and inductive reactance..
What is meant by impedance?
The total opposition to the flow of alternating current
B7
What units is impedance measured in?
In ohms.
