Electrical Engineering

The knot adds extra resistance and inductance to the wire, which in most cases will not make a difference to its performance in a normal circuit operating at dc or power supply frequencies.

yes

A fuse is used for protection. If you replace it with a nail, you give up the protection.

If the fuse blew, there was a reason, and the fuse protected you from the results of

what would have happened if it had not blown, like such minor inconveniences as

your TV set getting blasted beyond repair, or your house burning down.

Conceptually, it's the same as a passive voltage divider but with buffer amplifiers on the outputs connected to each dynode - the primary purpose of this is that it decreases the source impedance so that current flowing into the dynodes does not affect the voltages applied to any significant extent.

Manipulate the following equation, to make I the subject: P = I2R, where P = power, I =current, and R = resistance.

Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s).

A good way to accelerate electrons is with voltage. The higher the voltage, the more acceleration. Vacuum tubes do this. Like the cathode ray tube (or picture tube) in a conventional television. Electrons stream from the electron guns at the back of the tube to the phosphor coating on the inside of the face of the glass in front. The intervening space is highly evacuated. Electrons scatter terribly when striking anything, even gas atoms in air. We can really accelerate the electrons when we hit them with good ol' high voltage. In an x-ray generating tube the effects are even more dramatic. Amazing what a few extra tens of thousands of volts will do to speed the little guys up across the evacuated space between the elements of the x-ray tube. Oh, but there's a problem. Once speeded up like that, the electrons will eventually slow down by scattering. And when the highly accelerated electrons in the x-ray tube strike the metal target plate, they generate (surprise!) x-rays. And x-rays aren't to be fooled around with. They are penetrating ionizing radiation. There are linear and circular particle accelerators that can ramp up the speed of these little guys much more than can be accomplished in a vacuum tube, but it's hazardous work. More energetic x-rays can be generated by blasting a target in an accelerator with high speed electrons, and shielding in the target buildings of these facilities is yards thick. As an aside, particle accelerators are usually used to speed up protons, antiprotons and heavy ions and slam them around. Particle physics requires more work in those areas. Electron scattering is understood a little better than other aspects of nuclear physics, so there are limits on the amount of research using accelerators to speed up electrons. Think about it this way. An electron is to a proton something like a table tennis ball is to a bowling ball. Which one do you want to slam into stuff to see what happens, hmm?

I wanna use resistor , capacitor and amplifier 7173 for switch alarm circuit. How can i choice resistor and capacitor value because i wanna use 24V DC.

Some US Navy ships have a battleshort switch for certain systems.

In a capacitive circuit, you must first calculate the capacitive reactance (Xc) This is done by 2 x Pi x frequency x the value of capacitor. Then divide one by the answer. This will give you the capacitive reactance in ohms. You can then apply ohms law to find the current. So eg: A 10 ohm resistor is in series with a 150micro farad capacitor across a 230v 50Hz supply. find circuit current. So 2 x pi x 50 x 150E-6(means x10-6 on calc) 2 x 3.14159... x 50 150e-6 = 0.047123889(ans) Now 1/Ans = 21.22 ohms. So you can now add the 21.22 ohms and the 10 ohms together giving 31.22 ohms. This is the total circuit resistance. Now apply ohms law I = V/R So I = 230/31.22 = 10.83 Amps!

It depends if the starter is turning the engine over and its not starting the problem is not with the starter its with your ignition or fuel system most likely, If your start is making a whirring sound then its not making contact with the flywheel and you probably need a new starter

yes

Over the past few years the EU has begun taking some steps against the spread of nuclear weapons within its Common Foreign and Security Policy (CFSP). At the Thessaloniki Summit June 2003, the European Council adopted its first draft Strategy against the proliferation of Weapons of Mass Destruction (WMD). In order to assess the significance of the Strategy, this paper will first present and evaluate the Union's record in the field, then review the newly released Strategy, and finally make suggestions as to how it can be improved. The EU is not an unitary actor in the nuclear non-proliferation domain,

It takes 31.5 joules for 12 volts to move 2.5 coulombs.

Volts is joules per coulomb. The rest is just algebra, i.e. joules is coulombs times volts, 2.5 times 12 is 31.5.

Yes, Just for checking and supervising the magnetic alignment (Change of poles) over the rails.

it must be connected in parallel as always

The glass, 'dish', ('cap and pin') insulators used to support conductors from transmission towers are each rated to withstand a specific voltage. But this voltage depends upon the standards used by the electricity industry of the country in which you live but, typically, they are each designed for operating voltages within the range 10 - 12 kV. By dividing the effective line-to-earth value of the transmission voltage, by this value, you will be able to determine the the 'basic' number of dishes required.

This figure, however, will only be a guide, as the voltage gradient across the string of insulators is not linear. Furthermore, additional dishes are sometimes required according to the environmental conditions affecting the transmission line. For example, if the line is near the coast, the dishes might be subject to salt deposits; if the transmission line is near industrial factories (e.g. steel works) then the line might be subject to deposits from airborne waste from those factories, etc. So, often, the number of dishes will be greater than that number required to provide the basic insulation level.

Ask your local mains electricity power supply company to install a 63 Amp 3-phase supply at your site. It is not something you can buy in a shop like a battery. It is an electricity supply service that is different to a standard domestic home mains supply but is quite normal for places which use machinery such as workshops, factories, etc.

air flow speed

You cant.

Thin wires have a greater resistance rhan thick wires. Imagine a straw. The thinner the straw. the less liquid can get through. Wires work the same way.

Y=12sin(x(pi)) amplitude= 12 period = 2 phase shift = none or 0 vertical shift = none or 0

the AC electric generator was invente by Nikola Tesla. He invented in the late to early 1800's and 1900's. This idea was recently accepted by scienctists.
According to the website linked below, it was invented in 1663.

(12/3) Tan-1 = 75.96o ?

R = sqrt (52 + 122) = 13 ?

13 Sin (x+76o)

I'd double check elsewhere though

It depends on how many wires are in the cable. The more conductors in the cable set the longer it will take to splice them.