Pulsing DC Voltage through Current Loop

Thread Starter

ben sorenson

Joined Feb 28, 2022
If there was a pulsed dc voltage from a 60 volt battery going through a loop of wire (example) 500 loops of copper, would that increase the voltage. If so is there just a simple calculator out there that you can input turns of wire, voltage, and frequency etc just to see the effect it has on voltage and current?


Joined Jul 18, 2013
There will be voltage induced in the wire when the pulse collapses,
Look up Flemings RH/LH rule.
You need the means to create a magnetic field.


Joined Mar 14, 2008
There will be an inductive spike when the current is stopped, but it will be small due to the low inductance of an air core coil of wire.

What, exactly, are you trying to do?


Joined Aug 21, 2008
As usual @MaxHeadRoom is correct.

The voltage is not through a coil (hereafter "inductor"). It is across the inductor and current (the motion of charge carriers like electrons) is through and inductor.

The longer a govem voltage is applied to an inductor, the higher the current through it. When the voltage is first applied, current is zero amps. With time, the current increases mainly as a function of the inductance of the inductor and the resistance of the circuit.

The presence of a coil with current going through it causes a magnetic a build up of magnetic flux such flux is proportional to the current (amps) through the inductor time a constant related to the geometry and magnetic characteristics of the inductor.

Now for the good part: When the circuit is opened up the current slows to a stop then the magnetic flux collapses, and this change in the flux causes voltage to be generated in the coils of the inductor.

The speed of change of the flux, as explained in the link above is related to various parameters in the circuit including inductance, capacitance across the inductor and distributed within the inductor, plus some more mysterious effects I won't go into.

Does this help any?

Thread Starter

ben sorenson

Joined Feb 28, 2022

As has been asked before, what is it you are trying to accomplish? Don't talk about electronics, talk about the problem that you are tying to solve using electronics.
I don't really think I'm trying to solve a problem. I'm just trying to get an understanding of how things work. My understanding is that if you put a pulsed dc current through a coil of wire that the coils increase the voltage, even without a capacitor or diode so the more coils the more voltage. Like, if you had a bare bones circuit consisting of a battery, a momentary push button switch and a led, or resistor (yes I know led is a diode) if you had super human powers and could some how push the switch 5000 times a second, would it not increase the voltage over the diode? Or from the highest potential from the lowest potential?


Joined Mar 31, 2012
An inductor will force the current through it to be a continuous function of time. You can't change the current in an inductor instantly.

If you attempt to do so, the inductor will produce whatever voltage is necessary in order to impose that constraint.

Apply that rule to your circuit and you are good to do.

Otherwise, please provide a sketch of the circuit you are discussing. Don't make us guess how you are imagining that they are hooked up.


Joined Jun 5, 2013
Take a coil with significant inductance, for example, the primary of a small power transformer. Hold one of the bare leads with each hand and touch them to the terminals of a 1.5 V battery. Then break contact with the battery while still holding each bare lead. You will experience an increased voltage briefly.