ohms law
How do you find voltage?
V=IR
(Current times resistance)
Voltage dividers either come in loaded or unloaded. True or false?
True
Unloaded output voltage: Vo
Loaded output voltage: Vout
What is the difference between one cycle and one alternation for an AC sine wave.
The cycle is the whole positive and negative portion of the wave, and one alteration is either just the positive or just the negative.
L
What are the three faults in a circuit?
open, short, and changed value
How do you find power
P=VI (voltage times current)
or
P=V^2/R (Voltage squared divided resistance)
What is the purpose of a voltage divider?
The purpose of the voltage divider is to divide the applied voltage into one or more lower voltages.
How are Voltage and current related in an AC circuit?
They increase and decrease proportionally.
What happens to the magnetic field if current is increased?
The magnetic field expands.
T/F
In a resistor, voltage and current are in phase.
True
How do you find Voltage Drops for an individual resistor in a series circuit with more than one resistor?
Voltage drop= resistance times current on the particular resistor
Vd=RI
What does a voltage divider use to divide voltages?
Tap off points (output terminals)
T/F Current is induced by moving a conductor through a stationary magnetic field?
True. (You can either move the conductor or the magnetic field)
What does a capacitor do?
Capacitors have the ability to store an eletrical charge.
What is a measure of a capacitors ability to store an electrical charge?
Capacitance (which is measured in Farad)
How do you find total resistance in a parallel circuit?
Rt=(R1xR2)/(R1+R2) (Product over Sum method)
or
Rt=1/(1/R1 + 1/R2) (reciprocal method)
How do you calculate unloaded output voltage?
Step one calc Rt. (Rt=R1+R2+R3...)
Step two calc total current. (It=Va/Rt)
Step three calc output voltage. (Vo=It x Ro)
If flux variation is low and induction is low only a ______ amount of current is Produced.
small (so if both flux variation and induction is high the amount of current is also high)
What is the ability of a conductor to induce voltage when "cut" by a magnetic field?
Inductance
T/F: In an inductor voltage leads current by 90 degrees.
True
In a series parallel how do you find total resistance?
Split the circuit into parallel and series and find total resistance of each then add them together.
How do you find loaded output voltage?
step 1: Calc parallel resistance
Step 2: Calc circuit resistance (Rt=Req+R1+R2...)
Step 3: Calc total current (It=Va/Rt)
Step 4: Calc Voltage output (Vout=It x Rout)
How are square waves formed?
Square waves are formed from instantaneous rise and fall of polarities. They also maintain voltage level between the rise and fall time.
T/F Current travels through the capacitors.
False, current does not travel through the capacitor.
T/F: In a capacitor current leads voltage by 180 degrees.
False in a capacitor current leads voltage by 90 degrees.