Question

An opamp is used as a buffer between the source and the load
resistor R in the circuit . The opamp must be able to supply at
least what magnitude of current to ensure that V_{O}(t) =
V_{in}(t)?

Answer #1

A source circuit is used to drive a load with resistance RL =
30?. The Thevenin equivalent of this source circuit is
characterized by ?T = 2.5V and RT = 60?.
(a) Determine the maximum voltage ?max and maximum current imax
available from the source circuit.
(b) Compute the actual load voltage ?L and load current iL.
(c) Compare the actual power delivered to the load with the
maximum power available from the source circuit.

A V = 84-V source is connected in series with an R = 1.1-kΩ
resistor and an L = 34-H inductor and the current is allowed to
reach maximum. At time t = 0 a switch is thrown that disconnects
the voltage source, but leaves the resistor and the inductor
connected in their own circuit.
a) How much time, in milliseconds, is needed for the current in
the circuit to drop to 9 % of its value at t =...

2. A resistor R and an inductor L are connected in parallel to
an AC source providing a voltage v(t) = V sin(ωt).
(a) Draw a phasor diagram showing all the relevant variables of
this circuit. You should support your diagram by using Kirchhoff’s
rules and what you know about inductors to get full credit. Find
the peak value of the total current in terms of V, R, L, and ω.
(b) At an angular frequency, ω0 = 1.0 ×...

An
R = 58.9 Ω resistor is connected in series with a C = 18.1 μF
capacitor and a 190 Hz, 114 V source. Calculate the current in the
circuit.
What is the value of the inductor that must be inserted in the
circuit to reduce the current to one half that found in the
previous problem?

16. In an RLC circuit, a resistor R x 8 Ohm, a capacitor of 330
micro Faraday, and an inductance of 50 mH are connected in series.
The circuit is connected to an alternating source that delivers a
voltage equal to:
V-250- without (314 t) (volts)
Identify and calculate:
a) The maximum voltage of the source.
b) The frequency of the source.
c) The RMS voltage of the source.
d) Capacitive reactance.
e) Inductive reactance.
f) The impedance of the...

A solenoid with inductance L = 2.0 H is connected in series with
a resistor R = 10 ohms, as well as an AC power supply that is
providing current I(t) = I0 * cos( 2π * f * t ). The
current has an amplitude of 2 A and a frequency of 60 Hz.
a) Draw a diagram of the circuit.
b) At time t = 0 seconds, what is the change in voltage across
both the inductor and...

300 ohm resistor, series with 110 µm, 50 Hz power supply with 20 µF capacitor
It is connected. What is the impedance of the circuit? What is the amplitude of the current? the capacitor
What is the amplitude of the potential difference between the ends? What is the power factor? On
what must be connected to the circuit to ensure resonance and
What is its value?

3. A 75Ω source wants to connect a 300Ω load. If a
transformer is usedTo achieve maximum average power transfer, how
much must be the reason forTransformer turns?
4. A circuit consists of a current source, Is = 45 sin
(10,000 t - 30 °) mA inparallel with a resistance of 150 kΩ and a
capacitor of 2200 pF. Determine the valuecash from the stream that
supplies the source.

A resistor (R = 9.00 ✕ 102 Ω), a
capacitor (C = 0.250 μF), and an
inductor (L = 2.30 H) are connected in series
across a 2.40 ✕ 102-Hz AC source for which
ΔVmax = 1.15 ✕ 102 V.
a.) Calculate the impedance of the circuit.
b.) Calculate the maximum current delivered by the source.
c.) Calculate the phase angle between the current and
voltage.
d.) Is the current leading or lagging behind the
voltage?

7. A series
combination of a resistor R and a capacitor of a capacitance c =
0.40 mF is connected to 120 Vrms, 60 Hz ac source. Given
the rms current in the circuit is 5.00 A,
(a) determine the value of R.
(b) determine the rms current going through the
capacitor.

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