A device consisting of a resistor in series with an inductor
operates at 60Hz from an...
A device consisting of a resistor in series with an inductor
operates at 60Hz from an AC power supply. If R = 10? and L =
26.5mH, what capacitance should be added in parallel with the
device to achieve unity power factor??
An electromagnet can be modeled as an inductor in series with a
resistor. Consider a large electromagnet of inductance L =
12.5 H and resistance
R = 3.00
Ωconnected to a 24.0-V battery and switch as in the figure
shown below. After the switch is closed, find the following.
(a) the maximum current carried by the electromagnet
(b) the time constant of the circuit
(c) the time it takes the current to reach 95.0% of its maximum
value
A 24.0-V battery is connected in series with a resistor and an
inductor, with R = 4.60 Ω and L = 7.00 H, respectively.
(a) Find the energy stored in the inductor when the current
reaches its maximum value. ________J
(b) Find the energy stored in the inductor at an instant that is
a time interval of one time constant after the switch is closed.
________J
A
resistor of R = 10 Ω is connected in series with an inductor of L =
2 H and a direct voltage source of 50 V forming an RL circuit.
Determine the current at time t, assuming that current does not
initially flow through the circuit. What is the maximum current
flowing through the circuit? In what time is half the maximum
current reached?
An inductor (0.2 Henry) and a resistor (2ohms) are connected in
series with a battery of EMF 5.0 volts.
a) Draw the circuit (don't forget the switch)
b) At time t=0 and time= infinity find the current that passes
through the battery
c) What's the time constant for the circuit?
d) What's the back EMF provided by the inductor at t= 1.0
sec?
e) What's instantaneous energy saved in the inductor at time t=
1.0 sec?
f) What is the...
A 20 volt battery is connected in series to an inductor and a 2
Ohm resistor. After 8.36 milli-seconds, the current in the circuit
is 6.30 A. What is the time constant of the circuit in
milli-seconds?
Part A:
1800Ω resistor is connected in series with a 200mH inductor
and an ac power supply.
1. At what frequency will the combination have 2x the
impedance that it has at 120Hz?
Part B:
A 300Ω resistor is in series with a 0.115H inductor and a
0.600μF capacitor.
2. What is the impedance of the circuit at a frequency of f1 =
500Hz and at a frequency of f2 = 1000Hz? (Answer as Z1, Z2 in
Ω)
3. In...
a circuit that has a resistor, capacitor, and inductor
in series with a 5V AC voltage source
R = 5 Ω; L = 1 mH; C = 447
a) Find ω0 and f0
b) Complete the table
f = f0
f = 0.5f0
f = 1.5f0
I
VL
Vc
c) What is the phase between circuit current and applied voltage
at f = f0 (in radians)
d) Determine if the below statements are true or false
Below resonance (f <...
A series RLC circuit consists of a 58.0 ? resistor, a
2.50 mH inductor, and a 450 nF capacitor. It is connected to a 3.0
kHz oscillator with a peak voltage of 5.60 V. What is the
instantaneous emf E when i = I ? What is the
instantaneous emf E when i = 0A and is decreasing? What is
the instantaneous emf E when i = - I ?
10.An AC voltage source is connected in series to an inductor, a
capacitor, and a resistor of 8 Ohms. At the frequency when the
phase angle is zero, capacitive reactance is 7 Ohms. What is the
phase angle between the current and voltage at a frequency which is
a factor of 3.2 times less than this frequency? answer in degresss
and if negative
6. the resistance of a coil spun in a generator is 2 Ohms. the
coil is in...
A series RLC circuit consists of a 56.0 ? resistor, a
3.80 mH inductor, and a 400 nF capacitor. It is connected to a 3.0
kHz oscillator with a peak voltage of 4.10 V.
Part A
What is the instantaneous emf E when i =I?
Express your answer with the appropriate units.
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Part B
What is the instantaneous emf E when i =0A and is
decreasing?
Express your answer...