Electrical Flashcards
1
Q
What is reactance ?
A
It opposes the change in current and causes the current to be out of phase with the voltage.
2
Q
List 2 types of reactance
A
3
Q
How does capacitive reactance work ? ( DC )
A
- Current rush out when first closed
- Current build up , starts to oppose/ impede the force (Voltage)
- leading current
4
Q
What happens to capacitive reactance in low and high frequency ?
A
- low frequency - capacitors have time to charge - push back more - more reactance
- high frequency - no time to charge - less reactance
5
Q
What is the capacitive reactance formula ?
A
6
Q
What happens in inductive reactance ? (DC)
A
- when circuit is closed, inductor starts to create a magnetic field.
- the magnetic field doest want to change so oppose
- eventually it’s overcome by the voltage, magnetic field forms, current flow easily
7
Q
What happens to inductive reactance in low and high frequencies ?
A
- low frequency - lower reactance
- high frequency - higher reactance
8
Q
What is the formula for inductive reactance ?
A
9
Q
What is the phase angle for capacitive reactance ?
A
- -90° phase angle
- bcz when circuit close, current rush out
10
Q
What is the phase angle for capacitive reactance ?
A
- -90° phase angle
- bcz when circuit close, current rush out
11
Q
What is the impedance formula in a series circuit ?
A
12
Q
Phase angle can be found using the …. ?
A
Impedance triangle
