Electronics Engineering

The rays produced in a cathode tube in early experiments were actually just streams of electrons. They had a negative charge, which was discovered by JJ Thomson when he placed a magnet next to his cathode ray tube and say the ray bend.

When capacitors are connected in parallel, you add up their capacitances to obtain the overall capacitance of that 'bank'. The main reason for using two capacitors in parallel when decoupling, is that they have a lower overall inductance (electrical resistance in essence) to one large capacitor, which improves the decoupling effect. Using two capacitors also provides better high-frequency filtering for the power bus. One minor advantage of this, is that, you can obtain a certain redundancy when using two smaller capacitors in parallel, instead of only one, as if one capacitor fails, the other still acts to decouple the circuit, to a certain extent. Source: http://www.cvel.clemson.edu/emc/tutorials/Decoupling/decoupling01.html (this article uses other sources to back up their statements)

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In parallel wiring both headlamps get the power like two dogs pulling on separate leashes. That way, if one headlamp goes out the other still works. The other method of wiring, series, is like one dog's leash hooked to the collar of the other dog. If one leash (headlamp) breaks, both dogs quit pulling. It is a safety measure.

This depends on the signal and the type of cable. Standard definition digital video signals can be run for 1000 feet or more with low loss broadcast standard cable. HD is limited to around 400 feet with the same cable. However, there are always lower loss cables available to extend the maximum distance.

In the home, co-ax cables are often good for in excess of 100 feet although it depends very much on the signal source, the receiver and the cable itself.

Requirements to become an engineer vary in each country. In the United States, ABET (Accreditation Board of Engineering Technology)is a non profit organization that accredits United States postsecondary degree programs in applied science, computing, engineering, and technology to qualify universities for their degrees. To meet ABETs requirements, students need to fulfill the determined class work qualifying the graduate title of engineer. These classes are prominently heavy in physics, math, chemistry, biology. Once the student enters his junior year, he/she will declare a specific degree (electrical, mechanical, etc) which will focus specific classes pertaining to that field of study. Many companies will not consider degrees if their university was not ABET accredited.

To provide engineering to the public (construction, power grid, etc) some countries require a Professional Engineering license in which the graduate will have to sit first for the EIT (Engineering In Training) exam and then, 3 years later, can sit for the PE (Professional Engineer) exam.

In the US, there is no restriction who can claim the title of engineer, i.e. train engineer, maintenence engineer, Information Technology Engineer regardless of the above education. Though in Canada, it is illegal to claim title of engineer without their accrediation of education.

You need a positive input to operate the transistor and since most circuits are negatively grounded when the transistor is not in use it has a negative input current thus using less power most of the time.

• bipolar devices use both majority and minority current carriers
• unipolar devices use only majority current carriers

The element mercury is one of the poorest conductors of the elemental metals. The alloy nickel-chromium (Nichrome) is very resistive and is used to construct the heating elements in many appliances incorporating a thermal source. Saying that a metal is a "bad conductor" can only be supported by a comparison. As thermal or electrical conductivity was not specified, we can only say that in metals, the effectiveness of a metal in conducting one is generally an indication of its effectiveness in conducting the other. Metals that conduct electricity well also usually conduct heat well.

Current, voltage and resistance are related by the Ohm's law formula which states that current is directly proportional to the applied voltage and inversely proportional to the resistance at a constant temperature.

Stated mathematically:

I = E/R

where I = current in amperes, abbreviated to A

E = voltage in volts, abbreviated to V

R = resistance in ohms, usually signified by the Greek omega Ω

1 amp.

Could you please explain your question more fully?

Is it the last part of a longer question?

There are many types and sizes of cathode ray tubes, which weigh different amounts.

Regards

George

Maybe there's no voltage-source(AC or DC) because voltage is the one that motivates electrons to flow. It could be the connection of components in your circuit.

a little thing called an ammeter, you clip this onto your circuit and it measures the voltage!xxx ask again

Microprocessors tend to be much faster than microcontrollers. As real time systems usually don't require fast processors the additional power used for the extra speed is seen as wasted. Older boards are also preferred as it is less likely to contain bugs.

A step down transformer can do it safely. However there is going to be some loss of efficiency with actual loading so a step down of 1:0.5 ratio can do it the power required is to be implemented.

Ohm's Law V = I R

Voltage = Current x Resistance

A zener diode has a relatively flat voltage to current curve when reverse biased. Within limits, you can consider that the voltage across the zener diode is constant. You can use the zener as the primary regulator, so long as you consider the power requirements and dissipation of both the zener and the load, and you do not overload the zener. More often, the zener is used as a voltage reference in a larger power supply that uses other components, linear or switched, to supply the load.

Current flows in a reverse biased diode because diodes are not ideal. They do have leakage current and a breakdown voltage in reverse, just as they have a breakdown current in forward and a non-linear and non-parallel forward voltage to current curve.

It is also possible that you are looking at a zener diode. A zener diode is specifically design to conduct at a certain voltage in reverse.

I think you mean proton and electron...The main difference is charge. Protons are positive and electrons are negative. The mass of both protons and electrons are almost exactly the same. The size of electrons are slightly smaller than that of protons.

The Voltmeter is used to measure the electrical potential difference between two points...

so it's no use to connect it in Series , because the electrical potential difference between two points at the same line is zero ==> the readings will always be zero.

The Ammeter is used to measure the electric current in a circuit...

so it's no use to connect it in Parallel , because you want to know the current flowing in this wire.

note

the internal Resistance of the Ammeter is very little

and very high for the Voltmeter --> so they will not affect the circuit.