Electrical Engineering

Armored cable that has a inbedded tape that is used for grounding purposes.

The steel tape is wrapped around the inner conductors which carry the load current. A heavy rubber coating is applied over the steel tape layer. The steel and heavy rubber helps protect the cable from physical damage, e.g. by someone digging in the ground where the cable is buried.

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3.42*10^-11 farad.

Current can lag or lead voltage in an AC circuit when the load is what we call reactive. The idea that current is purely a function of voltage only applies when working with DC, or when working with purely resistive loads, such as light bulbs and toasters. Not so, when dealing with motors and power supplies.

What happens is that an inductor resists a change in current. That means that, given a particular voltage and current at a particular instant of time, if you change the voltage, the current will not immediately follow - it will lag - because the inductor is a stored energy device.

Similarly, a capacitor resists a change in voltage, which means that if you change the current, the voltage will not immediately follow - it will lag - also because the capacitor is a stored energy device. Flip over current and voltage in the analysis of a capacitor, and you find that the current will lead the voltage, as opposed to the inductor's current lagging the voltage.

This causes the phenomenon of power factor, which is basically the cosine of the phase angle between voltage and current. Power factor is the ratio of apparent power to true power.

due to decrease in power factor

the inducedd e.m.f and the change in magnetic flux have opposite direction

3/4 hp of course consumes less electricty

It is a type of plug/receptacle. Once you insert the plug, you can twist the plug to lock it in the receptacle.

Since Marlin didn't amke a 1899, it is most likely an 1898. These old Marlin shotguns never had a lot of value in good shape, and refinished they would be less. I see very nice ones going in the $200 range, and average or less in the $75-$100 range. I would guess a refinished will bring something in the average range. Marlin sent out a bulletin stating these early exposed hammer shotguns should not be fired, regardless of the ammo used. That has relegated them to wallhangers for most owners. Some diehard fans refuse to accept this, and continue to use these old Marlin pumps at their own risk.

fault location can be provided by microprocessor based relays or targets (multiple INST overcurrents are sometimes used to determine rough location).

A welding transformer is an electrical transformer used in welding power supply.

It pulls relatively low current drawn from the mains power (typically limited to 15 A to avoid tripping the circuit breaker) and converts it to the typical 50 A to 500 A used in arc welding and higher currents used in spot welding. The main difference between a Normal Step Down Transformer & a Welding transformer , is Not only to Step Down ( lower ) the outlet supply voltage and at the same time increase the Available Output Circuit Current, but to be also able withstand the Short Circuit Conditions on the Welding Output Side and especially for the Magnetic ( Iron Lamination Core ) Part of the Transformer. This Magnetic Path difference prevents the Supply side Electrical Circuit from Oveloading , espcially during the Striking of the Arc, when the Welding Electrode & the Welding Job touch to initiate an Arc, after which the Welding Electrode is lifted slightly by Experience, to maintain the required weld flow. A Normal Transformer of equivalent rating will not be able witstand this operation without burning out.

You can apply a lower-than-rated voltage to the primary winding of a transformer, and the secondary winding will then alter by the same proportion. So, for example, for a step-down transformer, if a 230-V primary voltage results in, say, a 115-V secondary voltage, then applying a 50-V primary voltage will result in a 25-V secondary voltage.

Not so far - and perhaps never.

But there are possibilities as the world gets more crowded.

We cannot represent diagrams on WA

Which materials make more static electricity when different objects are rubbed up against eachother.

One coil builds up a magnetic field when it is energized (and de-energized) and this induces an electric current in the other coil. The voltage produced in the second coil is determined by the number of coils wound on it compared to the first coil. This is called the turns ratio and only works with alternating current unless you are using it with a dc battery to make a spark in an ignition coil.

examples primary 100 turns, secondary 200 , is a step up transformer

ie from 10 volts AC to 20 volts AC 100 turns primary, 50 turns secondary, step down transformer

ie from 10 volts AC to 5 volts AC

The brightness of each bulb in a parallel circuit is the same as the brightness of a bulb in a simple circuit. By Kirchoff's voltage law, each element of a parallel circuit has the same voltage drop across it. With the same voltage, the same type of bulb will dissipate the same power, and have the same brightness.

to the air box

The ratio of voltage to current, or the impedance, of reactive elements such as capacitors and inductors depends on the frequency of the applied wave because they store energy, and the amount of energy they store is directly related to the frequency of the applied waveform.

When a DC voltage is applied to a capacitor, the current through the capacitor initially will be large, and will decay down to zero as the capacitor charges. Also, the voltage across the capacitor will be small initially and will increase over time to be equal to the applied voltage. This behavior results in a varying impedance when an AC waveform is applied. At a very low frequency, the capacitor will charge up and discharge similarly to if a DC source was switched into the capacitor for a long period of time there would be a large voltage drop, and small current = high impedance). As the frequency increases, the capacitor will appear more like a DC source was initially switched into the capacitor (low voltage drop and high current = low impedance).

A transformer's windings are pre-wound around insulated 'formers' or tubes of circular cross section. To achieve maximum flux density, the core should ideally be of circular cross-section, too.

A 'stepped core', then, describes the way in which the widths of the outer laminations of a transformer's core are progressively reduced ('stepped') in order to achieve a roughly-circular cross-section.

an electric motor is a copper winding or 3 separate windings depending on the phase, the copper winding is the centralised inside of a iron magnet, this is also how a generator is made instead of putting a current on you turn the windings to receive a voltage .

A motor when running has inertia in the rotating parts, which is a reserve of kinetic energy. The kinetic energy is found as the moment of inertia times the square of the angular velocity.

Shure 585SB mics sell for about $10 alone to $25 with the original box and papers. That price is per mic.

Motor Protection Circuit Breakers.