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Results tagged with electronics
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user 199893
Electronics is the study of electric circuits and electrical components, and the design of useful devices. Some questions in this tag may be more appropriate for the [Electrical Engineering(https://electronics.stackexchange.com/) SE site.
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Why is my voltmeter reading the supply voltage instead of load voltage?
If your voltmeter appears to be reading exactly 5.0V while delivering current to the 100 ohm resistor, it means the internal impedance of the power supply, which is in series with the 100 Ohm resistor …
- 77.9k
1
vote
Physics behind "nuisance trips" in a ground-fault circuit interrupter (GFCI) outlet due to s...
The outlet GFCI will interrupt any circuit connected to its load terminals, in addition to load plugged into the GFCI outlet itself, if the current to ground exceeds the nominal threshold of 5 mA rms. …
- 77.9k
1
vote
What does the $R$ in the formula $P=V^2/R$ for power represent?
$R$ in the equation is the resistance of the resistor when the power $P$ dissipation in the resistor is constant, i.e., at constant operating temperature.
Since the cold resistance is 36 Ohms, when th …
- 77.9k
2
votes
Accepted
Regarding Kirchoff's Loop Law
Energy is conserved. To state it simply, the loss of electrical potential energy that the charge acquires from, say, a battery equals the increase in kinetic energy of molecules of the resistors due t …
- 77.9k
0
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Is there anything other than Resistance, Capacitance, Inductance in a circuit?
Resistance, Capacitance and Inductance measure certain electrical
property of some matter. These term have even given rise to objects
like resistors, capacitors and inductors respectively.
They meas …
- 77.9k
17
votes
Accepted
Is the voltage ever undefined?
Is the voltage ever undefined?
The voltage, or potential difference, between any two points is always defined. It is defined as the work per unit charge required to move the charge between the two p …
- 77.9k
1
vote
Voltage across battery which is being charged
When two batteries are connected in parallel the voltage between the terminals of the batteries will depend on the internal resistance of each battery. So model each battery as an ideal voltage source …
- 77.9k
2
votes
What do capacitors actually do?
..they all pretty much said they store charge, filter out specific
frequencies. But what does that actually mean? What do you achieve by
doing that?
There are numerous practical uses of a capacitor' …
- 77.9k
1
vote
Potential drop across a dielectric capacitor with battery
Your book is talking about a capacitor that is changed to 100 volts and not connected to a battery. Inserting a dielectric increases the capacitance $C$. Since the charge $Q$ doesn’t change (it has no …
- 77.9k
1
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What's the point of using resistors?
When there is a battery connected in an open circuit, there is some
induced e.m.f, right?
Correct.
Now, if a battery is connected across its ends with a wire, with no
resistances or any other appli …
- 77.9k
0
votes
If voltage causes current to flow how can a battery have constant voltage but supply differe...
For an ideal (zero internal resistance) battery the voltage across its terminals is constant and equals its internal Emf, regardless of the current it delivers. For a real battery with internal resist …
- 77.9k
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How Equilibrium is Reached and Voltage Shared in a Series Circuit with Two Resistors
I will go through your analysis point by point attempting to use mechanical analogies where possible with the understanding that these analogues are rough and do not represent actual electrical behavi …
- 77.9k
1
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Using capacitors for rectification
Why is this the case? I thought a higher resistance results in a
slower voltage discharge rate, so wouldn't we want to increase the
discharge rate of the capacitor, hence a lower resistance loa …
- 77.9k
1
vote
Accepted
Floating Voltage Referenced to Ground
First, let me say that I'm not familiar with the details on how battery backups are connected to the loads in a building when they are switched onto the loads, so the following might not be correct. B …
- 77.9k
1
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Conceptually understanding RL circuits
Assuming you are talking about a series RL circuit with an ideal inductor, it is correct that $\frac{di}{dt}$ is maximum and the voltage across the inductor is a maximum equal to the battery voltage w …
- 77.9k