Questions tagged [voltage]

Voltage is the unit of measurement for electronic potential, from one point location to another.

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What happens when non-equal voltages are put in parallel? [duplicate]

If two batteries, say 2 volts and 5 volts, are connected in parallel, are there any problems? The higher voltage will then want to flow out, but also towards the lower 2 volt battery end, right?
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Kirchoff law of circuit confusing me

I have read that kirchoff first and second rule is in accordance to law of conservation of charge and energy respectively.But I cannot relate how it does justify.KCL just states that incoming current ...
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$V$-$I$ linear OR $V=IR$ is statement of Ohm's law?

What is the real statement of Ohm's Law: $V$-$I$ is linear OR $V=IR$? Looks like V-I is linear is ohm's law and conductors don't alway obey ohm's law and R=V/I is a general definition of R wheather ...
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Current in an AC circuit with only an inductor

In an AC circuit with only an inductor, we have a current that lags behind the EMF. So, at time 0 we have zero emf and max current. But in realty, how is this possible? How can we have a current ...
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Combination of ideal voltage sources

My lecture notes said that: You cannot have two (or more) ideal voltage sources connected to the same pair of terminals. Why is this so?
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Capacitor discharging through no load?

What exactly would happen in the ideal case where a capacitor were to discharge into a wire with zero resistance? Like in here: There is still charge on one plate of the capacitor, which will try to ...
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3answers
645 views

Why is current slowed down by resistance?

Let's say I wire the negative pole of a battery to the positive pole. Obviously, the battery will short circuit as the electron pool in the negative side will become attracted to the positive side and ...
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1answer
1k views

Emf Independent of External and Internal Resistance

Suppose a cell having emf, V and terminal voltage V' having internal resistance, r connected with an external resistance, R in the circuit in which current, I flows. We know that V=V'+Ir Can anyone ...
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Confused on why energy stored in capacitor deals with moving charge from one plate to other?

According to this video, and multiple other sources, we can calculate the energy stored by a capacitor using the idea integrating the work done by moving a charge from one plate to the other at ...
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Meaning of potential with respect to Earth

Potential of a body is defined as the amount of work done in bringing that body from infinity up to some point divided by its charge. The Earth has zero net charge, so the work done in bringing any ...
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Meaning of EMF induced in a loop

Q) Consider a square loop of side 'l' made of a metallic wire moving with a velocity 'v' which is perpendicular to one of its sides. There exists a uniform magnetic field 'B' perpendicular to the loop'...
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What is the voltage at every pair of points along a ideal wire that is connecting the two terminals of a battery?

If you stick a wire across a battery, obviously it is going to discharge the battery. This will be due to a voltage difference between the two terminals. However, the equation $V = IR$ tells you how ...
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Why do we use the term “voltage” for a battery?

Voltage or potential difference is the difference of potential energy of two points in space per unit charge in an electric field. A battery creates an excess in electrons in one side and a lack in ...
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4answers
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Why does only one of the DC circuit power equations work for me here?

I know that $$ P=IV=I^2R=\frac{V^2}{R}$$ I solved for the current using the loop rule $$I=.47$$ but to solve for the Power output of the 16V battery I could only find the power by finding the ...
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1answer
849 views

Applying Kirchoff voltage law to a short circuit

If you consider an ideal wire with no resistance that shorts an ideal battery, the only voltage drop that exists is the emf of the battery, with nothing to balance it. Obviously in the real world ...
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Ohm's Law and transmission of electricity

Electricity is transmitted at high voltages. It is said that this reduces current and consequently resistance. But according to ohms law, low current must face high resistance. How is this ...
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If I, being in the jump, touch the socket terminal with 220 potential relative to ground it will not hurt me?

If a person jumps and then touches an electrical outlet's hot terminal at $220 \, \mathrm{V} ,$ would it cause them harm? Would any current flow through them? If a person on the 11th floor of a tall ...
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Consider a conductor, we created a potential difference at the end of it

Consider a conductor, we created a potential difference at the end of it . Therefore , The electric field is produced inside the conductor. Now my question is: how is this electric field? Is the ...
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Is there some other ways to deduce resistance from current, than Ohm's Law?

Is there some other ways to deduce resistance from current, than Ohm's Law? Also, are Kirchoff's laws usually often in conjunction with Ohm's Law, because aren't $$\sum I=0, \sum V=0$$ slightly ...