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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.
0
votes
No commutator or rectifier?
Are there any other motors or generators that don't need a commutator
or rectifier?
That old work horse, the ac induction motor. There may be others as well, but I'm not aware of them.
Hope th …
- 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
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
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
vote
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
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
0
votes
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
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
How can I calculate the equivalent resistance of this circuit with resistors in parallel wit...
We are not supposed to provide solutions to homework and exercise questions, only guidance.
So here is some guidance;
The top circuit diagram below is your top diagram. The bottom diagram is equival …
- 77.9k
3
votes
Accepted
Common potential of two capacitors
The plates that are connected together by a non-resistive wire are at the same potential, even though, as you said, the charges themselves are “locked in” since, with the other plates not connected, t …
- 77.9k
1
vote
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
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
Summing up very basic terms in basic electricity
Many people have difficulty with electrical concepts because they feel those concepts are, for want of a better term, abstract. For me, it works best to try and describe those concepts with analogies …
- 77.9k
1
vote
Why the potential across the voltmeter is not affected by changing metals? How can we prove it?
A voltmeter is designed to have a high input impedance in order to draw as little current as possible so as not to affect the voltage being measured. The resistance of the leads is so small compared t …
- 77.9k
1
vote
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