Chapter 26
Equivalent Capacitance in SERIES equation?
Equivalent Capacitance in PARALLEL equation?
Ceq = (1/C1 + 1/C2 +1/C3...)^1
Ceq = C1 + C2 +C3...
Every minute 120 C of charge flows through a wire, what is the current through the wire.
2.0 A
Which bulb is brighter? (image given)
60 W
Draw a resistor, capacitor, switch for a circuit
Check.
vd
drift speed
graphically the electric potential is the (___________) the E versus position graph in one dimension
graphically the electric field is the (__________) of the electric potential versus position.
negative of the area under
negative of the slope
A and B are identical lightbulbs connected to a battery as shown. Which is brighter? (image given)
They are equal.
Equivalent Resistance in SERIES?
Equivalent Resistance in PARALLEL?
Req = R1 + R2 + R3....
Req = (1/R1 + 1/R2 + 1/R3....)^-1
What are the units for current
Amps, A
tau
Equipotential surfaces that are closer together represent a (____) electric filed.
strong
The current in the fourth wire is.... (image given)
2 A to the left
A voltage source circuit has a 9 V source and 2 resisters in parallel the first being 3 ohm and the second being 6 ohms. What is the current through the circuit?
4.5 A
Draw a battery
Check the positive and negative are drawn and labeled correctly.
ne vs Ne
number density vs total number of electrons
A capacitor charged to 1.5 V stores 2.0 mJ of energy. If the capacitor is charged to 3.0 V, it will store
8mJ
Uc = Q^2/2*C = 1/2 * C (Delta Vc)^2
Given is a segment of wire, what is the relationship between I1 and I1, J1 and J2, and E1 and E2
I1 = I2
J1 > J2
E1 > E2
The three bulbs are identical and the two batteries are identical. Compare the brightnesses of the bulbs. (image given)
A > B = C
Current Density Units?
A/m^2
J
Current density
What is the potential at each point? (image given)
A: 50 V
B: -200 V
C: -50 V
D: 50 V
1.0 x 10 16 electrons flow through a cross section of a silver wire in 320 µs with a drift speed of 8.0 x 10 -4 m/s. What is the diameter of the wire?
ne = 5.8 *10^28 m^-3
d = 0.926 mm
A 6 micro farad capacitor is in a circuit with 2 ohms and a switch. A second circuit with a 6 micro farad capacitor with a 3 ohm resister has a switch as well. Does the first or second capacitor discharge faster? (helps to remember time constant)
1st capacitor
What units does a capacitor have?
Farad, F
σ and ⍴
conductivity and resistivity