Electrical Engineering

That does not depend directly on the brightness of the bulb, it depends on the current drawn by the bulb (which depends on the efficiency of the bulb).

For example an incandescent bulb will draw much more current than a much brighter CFL bulb or LED bulb. Therefor switching to an brighter LED bulb can make the battery last much longer while switching to a brighter incandescent bulb will make the battery run down quicker.

It is the current transformer core meant for metering.

A sinewave is a geometric waveform that is defined by the function y=sin x.

There are no three phase 120 volt systems.

The secondary current is determined by the load. So, divide the secondary voltage by the load impedance.

The total effecive resistance of several individual resistances in parallel is less than

the smallest individual resistance, so in that sense I guess you'd have to say that

the lowest resistance 'dominates' the character of the whole parallel circuit.

AC commutator motors, like comparable DC motors, have higher starting torque and higher speed than AC induction motors. The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single-phase AC version suffers a double line frequency torque pulsation, not present in poly-phase motor. Since a commutator motor can operate at much higher speed than an induction motor, it can output more power than a similar size induction motor. However commutator motors are not as maintenance free as induction motors, due to brush and commutator wear.

Fencing uses a foil (sword).

definition:Lightning is a flash of bright light in the sky which is produced by electricity moving between clouds or from clouds to the ground.

so as we know already lightning is of two types direct and indirect lightning.

These are anyway a discharge of electricity either positive or negative potential just discharges to ground known as lightning.

definition:to put an earth wire between a piece of electrical equipment and the ground.

Where as earthing is manually or artificially done to discharge any potential either to prevent any over voltages such as lightning or fault currents etc.,

For a long time, The capacitor will be charged to the voltage of the DC battery, the positive side of the capacitor touching the positive terminal of the battery. Not much DC current will conduct, except for some tiny leakage current due to imperfection of the cap. The battery will be drained eventually.

Put the wires in your but!

Uninterruptable Powersupply

due to residual magnetism

Induction

yes . A change of motor would be required. The motor windings would have to be totally different. three hot leads instead of two. And three phase would have to come from your provider.

Grease is not used in transformers. An insulation oil is used to circulate around the internal coils to dissipate the heat generated when the transformer is in operation. Thermo syphon principals are used. Warm oil moves to the top of the transformer case and is displaced by cooler oil moving to the bottom creating a flow in the oil and there by aiding in the cooling of the coils. Transformers in larger sizes have cooling fins or tubes through which the oil flows to give more surface area to dissipate the internal coil heat. Smaller size transformers use the oil contact with the oil containment shell of the transformer to dissipate the heat.

A transient, surge, spike, etc.

A lighting contactor is a special contactor that is used only for control lighting installations. The contact ratings are incandescent rating and not to be used for motor control. The contactor allows banks of lights to be controlled by one device. The controlling devices could be switches, computers or photocells to bring the lights on at any preset times.

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A Contactor used to supply the Power to the lights

A round figure might be 85-90%. But smaller motors are designed for lower efficiency to reduce the cost of the motor, and high-powered motors are designed to be highly efficient, despite the increased cost, to avoid wasting a significant amount of energy.

As with most questions it depends.

Do you have power available nearby?

Would you be willing to run power?

How large is the gate?

How heavy is the gate?

How well does it swing?

Are there any aesthetic concerns?

Is there space available to have a pad mounted unit or must it be a more compact unit?

Are you going to hire someone or does it need to be a DIY style operator?

Generally the saying you get what you pay for is true, cheap home improvement type gate operators are not reliable in the long run and have a high failure rate.

Most manufacturers do not design their products to be installed by the do-it-yourselfer because these are complicated machines which can and have killed when not installed properly.

For professionally installed operators where power is available I generally Reccomend the Viking but it is not solar friendly and Viking may not honor warranty if it is not installed by a professional.

For solar powered commercially installed I would look into Chamberlain, Linear, or Apollo.

For DIY I would look into Patriot, Apollo if you can weld or can get an installer to make up hardware for you.

The commutator has two functions: (1) it enables current to pass to the external fixed wiring from the rotating armature, and (2) it is a rotating rectifier, which converts the a.c. voltage generated in the rotating armature, to a d.c. voltage.

stator,roto

volts times amps equal watts, or 550 lbs per sec equals 1 horse power.

An ammeter is connected in series. A voltmeter is connected in parallel.

ammeter should always be connected in series instead of parallel becoz it is a low resistance device and we know that resistance is inversly proportional to current so more current will pass through it and if it is connected in parallel than it may get damaged

during sport or work a lot injury could happen ..

many people face to injure their self because they don't wear the right equipment or they don't use any protective. so to keep your self and others around you out of any injury or dead it is important to wear protective clothing and equipment...