Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
Potential difference across capacitors in a parallel circuit
|
1. the are the same
2. each is equal to the voltage of the battery |
|
Energy Stored on a capacitor
|
Estored = 0.5C(V)^2=0.5 (Q^2)/C=0.5VQ
|
|
total capacitance (Ceq) in a parallel circuit
|
Ceq= C1+C2+... Cn
|
|
total capacitance (Ceq) in a series circuit
|
1/Ceq= 1/C1+1/C2+...1/Cn
|
|
total work done in charging a capcitor
|
W= 0.5QΔV
|
|
The Capacitor is connected to an constant emf source and then the dielectric is inserted. The capacitor with dielectric are connected to a constant voltage source.
What are the properites of the capacitor? |
*Voltage remains constant*
1.C = k Co 2.Q = k Qo 3.V = Vo 4.E = Eo 5.U = k Uo |
|
The Capacitor is charged up by an emf source and then disconnected. The dielectric is then inserted when capacitor is not connected to a voltage source.
What are the properites of the capacitor? |
*Charge is held constant*
1.C = k Co 2.Q = Qo 3.V = Vo /k 4.E = Eo /k 5.U = Uo /k |
|
Charge across capacitors in a series circuit
|
1. They are the same
2. the magnitude of the charge must be the same on all the plates |
|
t/f
The conventional current direction used in circuits is the direction of the electrons |
f
it is the direction of positive charge. |
|
Total resistance when connected in series
|
R = R1 + R2 + R3 + R4 + ...
|
|
Total resistance when connected in parallel
|
1/R =1/R1+1/R2+1/R3+1/R4 + ...
|
|
Kirchoff's rule regarding conservation of charge
|
The sum of the currents entering any junction must equal the sum of the currents leaving the junction
|
|
Kirchoff's rule regarding conservation of energy
|
The sum of the potential differences across all the elements around any closed cricuit loop must be zero
|
|
Current through resistors in series
|
1. they are the same because any charge that flows throug hone resistor must flow through the others.
2. It=I1=I2=In |
|
Potential difference across resistors in series
|
ΔVt= ΔV1+ΔV2+...ΔVn
|
|
Potential difference across resistors in parallel
|
1. they are the same because each is connected directly across the battery terminals
2.ΔVt=ΔV1=ΔV2=ΔVn |
|
Current through resistors in parallel
|
It=I1+I2+In
|
|
Equation of magnetic force of charge q moving through a magnetic field
|
F=qvB sinΘ
where Θ is the angle between v and B |
|
The right hand rule: for postive or negative charges?
|
Positive
|
|
The left hand rule: for postive or negative charges?
|
Negative
|
|
Magnetic force of a wire length "l" carrying a current I
|
F=BIL sinΘ
|
|
Troque on a current-carrying loop of wire in a magnetic field B
|
t=BIA sinΘ
A= cross-sectional area |
|
Radius of the circular path moved by a charge q when perpendicular to B
|
r=(mv)/qB
|
|
Magnetic field, distance r, from a wire carrying a current
|
B= (μoI)/(2πr)
|