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Results tagged with electric-current
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user 222195
A measure of the rate at which electric charge is transported (especially through a circuit), it has units of charge/time.
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When the voltage is increased does the speed of electrons increase or does the electron dens...
Current is the amount of charge (electrons) passing a point in a wire per unit time. Voltage is the amount of energy in joule in every charge of 1 coulomb moving through the wire. Increase in current …
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How does back emf occur if a system can’t do work on itself?
The lost energy you're looking for is what is stored in the field as potential, and it's not lost (at least a major part of it) but preserved. When a current runs through a conductive wire, a magnetic …
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Flow of charges inside a battery
A battery is a reservoir of electrons at a potential difference relative to another reservoir of seemingly positive charges (ions) separated by a distance, hence potential (so the electrons don't flow …
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Relationship between concentration and resistance of aqueous solutions
Why is simple: When you dissolve more of any salt that ionizes in water, there are more ions to "shuttle" energy carrying electrons across at a time. How is a bit more complicated. You see when you di …
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Empty and fresh battery in series
A battery works by harnessing an electric potential to drive electrons through a conductor. When two batteries are in series, there's a sandwich of different potential regions in the pattern negative- …
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3
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Why isn't there any current in the primary if secondary circuit is opened in a transformer?
It doesn't. A transformer works by magnetic induction between the two coils, it doesn't matter whether the secondary is loaded or not. The primary, if connected to a source of current, conducts just f …
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Accepted
How does a load/resistor affects a Transformer?
Just like how the induction coil in an induction motor feels the resistance of the load on the rotor. A magnetic field moving relative to a charged particle or vise versa experiences a force on it equ …
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Does Ohm's law $V = IR$ mean voltage causes current, or does it just say that voltage and cu...
It depends on how you want to look at it. Voltage is defined to be the energy required to raise charges to a particular potential OR the amount of energy (potential or dynamic) per coulomb of charge i …
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Potential in open branch of a parallel circuit with grounding
The electric potential at $Q$ will be negative, why? I'll explain in a bit.
Of course there's a potential difference across $Q$ and ground point and $Q$ and $R_3$, which are different.
You're right t …
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