analog power!

anonymous asked:

Hola ur blog is so cool and I think it's really cool you like to help people. I'm a bit confused on what power is in a circuit and it's relationship to current, resistance, and voltage... can you help explain? Tysm!!

The Hydraulic Analogy

There are a couple of times especially in engineering where it is easier to think of DC electric circuits in terms of hydraulic circuits and vice versa. And I think in this case it might help you as well.

Current: The amount of water flowing through a section of a pipe over time

Voltage: The difference in pressure between two points in the water circuit.

Resistance: Narrow constrictions offer high resistance and every pipe like every other wire offers resistance to the flow of water.

Power: It is the rate at which the energy stored in the water is used to drive a mechanical device like a water wheel.

Think of it like this: How fast the wheel is going to spin is dependent on the amount of water hitting it (current) and how much pushing this quantity of water does (voltage). 

(pressure = force applied / area)

Hope this helps and I am glad that you are finding the blog to be useful. Cheers!


* More about the water analogy for electric circuits

** Where does this analogy fail ? (Very important to know)

“Imagine the earth to be a bag of rubber filled with water, a small quantity of which is periodically forced in and out of the same by means of a reciprocating pump, as illustrated. If the strokes of the latter are effected in intervals of more than one hour and forty-eight minutes, sufficient for the transmission of the impulse thru the whole mass, the entire bag will expand and contract and corresponding movements will be imparted to pressure gauges or movable pistons with the same intensity, irrespective of distance. By working the pump faster, shorter waves will be produced which, on reaching the opposite end of the bag, may be reflected and give rise to stationary nodes and loops, but in any case, the fluid being incompressible, its enclosure perfectly elastic, and the frequency of oscillations not very high, the energy will be economically transmitted and very little power consumed so long as no work is done in the receivers. This is a crude but correct representation of my wireless system in which, however, I resort to various refinements. Thus, for instance, the pump is made part of a resonant system of great inertia, enormously magnifying the force of the imprest impulses. The receiving devices are similarly conditioned and in this manner the amount of energy collected in them vastly increased.“

–Nikola Tesla

“Famous Scientific Illusions.” Electrical Experimenter, February, 1919.

***The Power of Constructive Interference and the Wireless Transmission of Energy***

“Suppose the whole earth to be like a hollow rubber ball filled with water, and at one place I have a tube attached to this, with a plunger in the tube. If I press upon the plunger the water in the tube will be driven into the rubber ball, and as the water is practically incompressible, every part of the surface of the ball will be expanded. If I withdraw the plunger, the water follows it and every part of the ball will contract. Now, if I pierce the surface of the ball several times and set tubes and plungers at each place the plungers in these will vibrate up and down in answer to every movement which I may produce in the plunger of the first tube. If I were to produce an explosion in the center of the body of water in the ball, this would set up a series of vibrations in the whole body. If I could then set the plunger in one of the tubes to vibrating in consonance with the vibrations of the water, in a little while and with the use of a very little energy I could burst the whole thing asunder.”

–Nikola Tesla

“Tesla Grips the World.” New York Sun, June 6, 1897.

Reading Portrait of a Priestess: Women and Ritual in Ancient Greece, By Joan Breton Connelly and it’s pretty neat. Here are some interesting points so far.

“….. Instead, religion was embedded in every aspect of life and was intensely local, highly dependent on regional tradition.”

“The Greeks did not even have a separate word for religion, since there was no area of life that lacked a religious aspect.”

“Cleaning, weaving, washing, dressing, decorating, grinding, cooking, and feeding can all be seen as the work of women in both house and sanctuary across the ages. It is this powerful analogy between house and temple that provides a critical foundation for female agency in Greek religion”

“For priestesses, failure to observe cult requirements represented not just a lapse in duty but a serious crime. It could arouse the wrath of the divinity and cause disorder in the harmonious functioning of the community.”

“As practitioners of household worship and the host of rituals occasioned by domestic life, Greek women assumed the role of ‘priestess’ within their own families.” This is interesting to me, because I’ve seen the same idea discussed about men as the head of the household assuming a role of ‘priest’ within the home, but this is the first time I’ve seen the idea posed for women.

anonymous asked:

Also like a lot of teen girls who "fetishize" are actually gay themselves and can't express it so they do what other straight girls do and make it about boys even though it's really about same gender love

yeah not to mention how most media is male dominated anyways so there’s just more male relationships to project upon as a questioning lgbt person. again i don’t want to deny that there can be homophobia and other bad behaviors with women & m/m ships- just saying that comparing them to dudes fetishizing f/f is not analogous in terms of power