I am getting the last one wrong and I don't know why. Help with the 3rd question please.

C)
Voltage, V = 30 - 25 = 5 V
5/R = 30/(R + 150)
5R + 750 = 30 R
750 = 25 R
Resistance, R = 750/25 = 30 ohm
Comment in case any doubt please rate my answer...
I am getting the last one wrong and I don't know why. Help with the 3rd...
The switch in an effective LR series dc-circuit (consisting of an emf and a coil with inductance L = 0.5 H and unknown internal resistance) is closed at t = 0 sec. At t = r, the current is 9.5 A and is increasing at a rate of 1.1 A/s. What must the internal resistance of the coil be? A step-up transformer is designed to have an output voltage of 1800 V (rms) when the primary is connect across a...
Help please ...!
An RL circuit comprised of one resistor and one inductor is shown in the figure below. The resistor and inductor are connected to a source of emf with negligible internal resistance by a switch a. The emf for this circuit is 12.0 V. The resistance of the resistor is 0.35 Q, and the inductance of the inductor is 53 mH. For the circuit below: Sketch the graph of current through the inductor as a function of time...
A circuit is constructed with
five resistors and one real battery as shown above right. We model.
The real battery as an ideal emf V = 12 V in series with an
internal resistance r as shown above left. The values for the
resistors are: R1 = R3 = 22 Ω, R4 = R5 = 82 Ω and R2 = 147 Ω. The
measured voltage across the terminals of the batery is Vbattery =
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A circuit is constructed...
1. An RL circuit comprised of one resistor and one inductor is shown in the figure below. The resistor and inductor are connected to a source of emf with negligible internal resistance by a switch a. The emf for this circuit is 12.0 V. The resistance of the resistor is 0.35 12, and the inductance of the inductor is 53 mH. For the circuit below: a. Sketch the graph of current through the inductor as a function of time after...
1. An RL circuit comprised of one resistor and one inductor is shown in the figure below. The resistor and inductor are connected to a source of emf with negligible internal resistance by a switch a. The emf for this circuit is 12.0 V. The resistance of the resistor is 0.35 12, and the inductance of the inductor is 53 mH. For the circuit below: a. Sketch the graph of current through the inductor as a function of time after...
Two coils shown in the diagram are wound around two iron cores.
The primary coil has 500 turns, self-inductance 7.0 mH and
resistance fo 5.0 ohms. The battery supplies an EMF of 10.0V. The
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inductance of the system is 3.0 mH.
a) What is the time constant?
b) How much current is flowing in the primary after one time
constant?
c) How much back EMF is generated in the primary...
1. An RL circuit comprised of one resistor and one inductor is shown in the figure below. The resistor and inductor are connected to a source of emf with negligible internal resistance by a switch a. The emf for this circuit is 12.0 V. The resistance of the resistor is 0.35 , and the inductance of the inductor is 53 mH. For the circuit below: a. Sketch the graph of current through the inductor as a function of time after...
Please help me answer 100 correctly i am sending this question
for 3rd time but i didnt get proper answer please help me answer
with formula and explanation . please make sure hand writting can
read easy. if can please type ur answer. please help me.
b) The capacitance, inductance and load resistance of a Boost step-up dc-to-dc converter are 1.0μF, 10μΗ and 20.0Ω respectively. It is used to converter 10V dc input to 30V dc output. The switching frequency...
Please help, I'm struggling. Thank you
An RL circuit comprised of one resistor and one inductor is shown in the figure below. The resistor and inductor are connected to a source of emf with negligible internal resistance by a switch a. The emf for this circuit is 12.0V. The resistance of the resistor is 0.35 12, and the inductance of the inductor is 53 mH. For the circuit below: a. Sketch the graph of current through the inductor as a...
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