# Questions tagged [electric-circuits]

An electronic system, with closed loop current flow, and relative electrical potentials present across electrical components.

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### Why/when is an indirect AC - DC - AC frequency converter superior to a direct AC-AC frequency converter? [on hold]

I am currently studying wind power and the power electronics used for it. In wind power a generator is driven by wind, thus the resulting power is of widely varying frequency and amplitude. The power ...
278 views

### How is it possible for the induced emf to take negative values in Faraday's Law of induction?

Faraday's Law of induction states that the work done per unit charge by the (induced) electric force along a loop of wire, or the emf, is minus the rate of change of magnetic flux through the loop/...
33 views

### Current in Wheatstone bridge

When the galvanometer and cell are interchanged at the balance point of the Wheatstone bridge, the galvanometer will show no deflection. There is no change due to the shifting of the position of cell ...
52 views

### Conflicting models about how energy transferred in an electric circuit [duplicate]

I've been studying DC circuits recently, but I've run into some confusion concerning how batteries deliver energy to circuit elements. From what I've read online, it seems that energy in circuits ...
26 views

### Zener diode as a voltage regulator [on hold]

I tried to solve the following exam problem. The problem asks to find a range of load resistor values for which the circuit can be used as a voltage regulator satisfactorily. My question is; What '...
71 views

### How do I calculate the total resistance of this circuit? [on hold]

How do I calculate the total resistance of this circuit? From the data from a site it can be calculated that the total resistance is $\frac{12\ V}{5.14\ A}$ which is $2.33\space \Omega$. But I don't ...
35 views

### How to increase Sensitivity and precision of a measuring sensor?

Considering the definition that Sensitivity: Relation between the maximum of range, the sensor can $\frac{i}{p}$ to the corresponding $\frac{o}{p}$ given by the sensor due to it. Ex: A pressure ...
12 views

### Calculate the power supplied by voltage source [on hold]

Hi for this question (sorry about the picture), if the current source ($2A$) receives $20 W$ of Power, determine the $R$ of the resistor and the power of the voltage source. I sort of know I have to ...
42 views

### Why are there many turns in the primary coil of a step-up electricity transformer?

Since the voltage in a coil is proportional to the number of turns, the ratio of voltages is equal to the ratio of turns. So if you need a big increase in voltage, what stops you from having one turn ...
44 views

### Why does self-inductance still allow variation of current in circuit?

Taking a solenoid as an example, when constant current $i$ is passed through the solenoid constant flux is seen. But when the current starts to vary, the magnetic field created by a changing current ...
42 views

### Minimum and Maximum values of Effective Resistance [closed]

Assume we have resistors of resistances $R_1$, $R_2$, $\ldots$ , $R_n$. Let these resistances be connected in a network. Are the following statements true? $(i)$ Effective Resistance is maximum when ...