Electrical Engineering

1 Watt means 1 Joule per second, so 60 watts means 60 Joules per second. A light bulb that burns energy at that rate for 3 seconds uses 180 Joules.

smelly

hydro treated light nephthanic distillate

'Salient' means 'sticking out', so if the pole sticks up from the rotor shaft, then it is a salient pole machine.

The cause of resistance is the opposition to the flow of charges.Resistance occurs due to the collisions between charges inside a substance.

The resistivity of a wire can be found out by using a meter bridge or a slide wire bridge.

Resistance does not change frequency.

Frequency cannot be changed without very sophisticated equipment, often called Variable Frequency Drive, or VFD, which is used in motor starters today.

3 × 10^6 V/m

My big kitchen clock runs on a single AAA cell. That's 1.5 volts.

My son has a solar-powered watch. The solar cell is a lot less than 1.5 volts.

I used to have a clock in my office that ran on the voltage between two needles stuck into a potato.

I had to get rid of it after a long weekend when the clock was stopped and the office was full of fruit flies.

But the potato was not a tremendous voltage source.

I don't know what's the smallest voltage that a clock has ever run on, but it's obviously a lot less

than one volt.

good question it depends on the uses, some things you just need a energy storage set up if its not a constant use that way it has stored power with the incoming so its feeding the reserve n using off both so it doesn't drain your power n possible slow other device's down. that doesn't explain ( why increase volts ) but its a way you don't have to in some home uses.

Probably. Although it may be possible to make one without using a zener diode if you really want to. The zener diode is often used to keep voltage levels at exactly the desired value (ie 5 volts). Other methods may exist to do this, but I'd wager can be much more complicated.

The motor will hum and act like it is trying to run it's commonly known as single phasing, it will also heat up quite rapidly and if you set up your circuit correctly and have the proper thermal overload protection on it it will trip and protect the circuit and the motor. If the problem is in the motor winding you will have to rewind the motor or replace it

Pressure from the voltage.

Read the specification plate on the motor to determine the amount of current that the motor uses, as well as the voltage and phase.

Most likely, it will be a 3 phase motor, so you can't simply connect it to your house wiring, but without sufficient information, it is impossible to tell you all of the specifics.

<<>>

The code book rates the amperage of a three phase 40 HP motor by different voltages. at 200 volts - 120 amps, 230 volts - 104 amps, 460 volts - 52 amps and 575 volts - 52 amps. A breaker for a motor has to be sized to 250% of the motors full load amps. Also the wire size for a motor has to be 125% of the motor full load amps.

An ohmic resistor is a resistor that obeys Ohm's law, and a non-ohmic one dose not. All resistors resistance will begin to change as there temperature changes, and often we need a resistor with a steady resistance, thus some resistors, which we refer to as ohmic, will disperse the heat being generated and therefore it will keep a steady resistance. Resistors that do not disperse their heat will have varying resistances and therefore are non ohmic.

Ohms law, named after the German physicist Georg Ohm, states that the current through a conductor, between two points, is directly proportional to the potential difference (voltage) across the two points, and inversely proportional to the resistance between them.

~Ben Frilay-Cox

2

a capacitor that keeps time Capacitors do not keep time they do however charge at a specific rate of 63% of the applied voltage from a source that can be used to relate to timing since the source voltage can be calculated after a time lapse

It is a large umbrella It is a large umbrella

Energy saving bulbs reduce electrical consumption by about 75%, reduce bulb changes by x10 to x50 times. The savings in electricity and their endurance more that compensates for the higher purchase price.

When electrical current flows through a circuit it moves by electrons in one molecule in a conductor [wire] "bumped" against the next molecule causing one of that next molecule's electrons to bump into the next molecule of the wire. This is true of both Alernating and Direct current. The difference is that in Direct Current circuits, the flow is always from, and in ONE direction. With Alternating Current, the flow direction changes, first in one direction, then in the opposite. In other words, back and forth. One set [one forward and one back] is called a cycle. When one hears about cycles in AC, that indicates how many cycles occur in one second, thus US AC 60 cycle current means that the current changes flow direction 60 times per second. In most of Europe, I think, AC current is set at 50 cycles. The AC cyclic rate is determined arbitrarily by the windings in the alternator, AND the RPM at which the alternator operates.

A halogen lamp a uses a tungsten filament, but it is encased inside a much smaller quartz envelope. Because the envelope is so close to the filament, it would melt if it were maA halogen lamp also uses a tungsten filament, but it is encased inside a much smaller quartz envelope. Because the envelope is so close to the filament, it would melt if it were made from glass. The gas inside the envelope is also different -- it consists of a gas from the halogen group. These gases have a very interesting property: They combine with tungsten vapor. If the temperature is high enough, the halogen gas will combine with tungsten atoms as they evaporate and redeposit them on the filament. This recycling process lets the filament last a lot longer. In addition, it is now possible to run the filament hotter, meaning you get more light per unit of energy. You still get a lot of heat, though; and because the quartz envelope is so close to the filament, it is extremely hot compared to a normal light bulb. de from glass. The gas inside the envelope is also different -- it consists of a gas from the halogen group. These gases have a very interesting property: They combine with tungsten vapor. If the temperature is high enough, the halogen gas will combine with tungsten atoms as they evaporate and redeposit them on the filament. This recycling process lets the filament last a lot longer. In addition, it is now possible to run the filament hotter, meaning you get more light per unit of energy. You still get a lot of heat, though; and because the quartz envelope is so close to the filament, it is extremely hot compared to a normal light bulb.

This depends on whether the wire is copper or aluminum. In aluminum, you need to go UP one wire size to carry the same amount of electricity, because copper is a better conductor than aluminum. The normal ratings are as follows for the most common wire sizes in houses

Copper

14 gauge=15 amps

12 gauge=20 amps

10 gauge=30 amps

8 gauge= 40 amps

6 gauge= 50 amps

and so on. it goes all the way to a 2/0 which will carry 200amps

In aluminum you step up a size, as in

12 gauge= 15 amp

10 gauge=20 amps

and it would take a size 4/0 aluminum to rate at 200 amps, which is pretty much the standard household amperage requirement in most places in the US

Ideally an overload relay should be set above maximum load by some small amount, but below the capability of the electrical circuits being protected. For example, breakers in your home are designed for overload protection; typical home wiring is 14 awg - 12 awg. If you have a 14 awg wire (good for 15A), you may install a 10A breaker, but if needed could install a 15A breaker depending on codes. A 20A breaker would not provide overload protection since it is too big. It would provide fault protection.

the starting current of motors can be controlled by using an additional resistance in the beginning and gradually decreasing it.Motor starters do the same