1
Whats the unit of measurement for inductance?
Henries
What is the symbol for Henries?
H
How is vectors added together that are in phase with each other?
Simply added together
If the frequency of a purely inductive circuit increases, current will?
Increase
What is the correct letter designation for capacitance reactance?
Xc
What is an inductor?
a coil of wire wrapped around a core.
What is the phase relationship between voltage and current in an purely inductive circuit?
Voltage leads current by 90 degrees
How are vectors added together that are 90 degrees out of phase with each other?
Pythagoreans Theory
If the frequency of a capacitive circuit increases, what happens to current flow in the circuit?
Increases
Which of the following does not belong when working with capacitors?
1. Voltage rating is greater than present voltage
2. Discharge capacitor after turning off the circuit
3. Be sure you are well grounded before handling capacitors
4. Observe polarity marks when connecting a capacitor to a circuit.
3. Be sure you are well grounded before handling capacitors.
The opposition to current flow in an inductor is known as what?
Inductance reactance
Applied voltage and induced voltage is how much out of phase with one another?
180 degrees
What is the total inductance of a series circuit that contain three inductors?
3H, 5H and 10H
18H
Connecting inductors in series will cause current to?
When is a capacitor considered fully charged?
99.3%
What factors of an inductor determine the inductance?
1. Number of turns
2. Spacing between the turns
3. Cross sectional area of the core
4. Permeability of the core
What is Counter EMF?
The induced voltage
What is the current at a 100 microfarad capacitor when the applied voltage is 120V @ 60Hz?
4.52A
a 20uF capacitor operating in a circuit produces a voltage drop of 5V at 1 kHz. What is the current flow through that capacitor?
0.628 A
A capacitor is connected to a 480V @ 60Hz circuit. What is the capacitance of the capacitor if the current through it is 32A? answer in uF
176.93 uF
What is the definition of inductance?
The ability to induce a voltage into itself or an adjacent circuit
What nationality was Heinrich Lenz?
German
Whats the total current of a series circuit that contain 3 capacitors and applied voltage is 120V @ 500 Hz?
1. 5 uF
2. 10uF
3. 30uF
Xc1 = 63.69 ohms
Xc2 = 31.85 ohms
Xc3 = 10.62 ohms
Xct = 106.16 Ohms
I = 1.13 A
the total capacitance of a parallel circuit is calculated the same way as the total resistance in what type of circuit?
Series
7.24A