Electronics Engineering

A galvanic isolator is a device which blocks low voltage DC currents coming on board a boat. The reason why these currents are blocked, they cause corrosion to metal underwater.

area of the conductor, length of the conductor and temperature around the conductor..........

The simplest way to understand it is to use Ohm's law: E = IR. Voltage (E) can be though of as pressure that drives the current. Voltage is measured in volts. Current (I) can be thought of as the actual flow of electrons within the circuit. Current is measured in amperes, or amps. Resistance (R) can be thought of as exactly that - the amount of opposition to current flow in a circuit or component. Resistance is measured in ohms. So let's see how this works. E = IR. If E is constant (typical for a battery) then the current (I) is equal to the voltage divided by the resistance. Let's use a voltage of 12 volts, and a resistance of 2 ohms. The current is I = 12 volts/2 ohms= 6 amps. If you remember Ohms law, you can predict what will happen in simple circuits using only a little bit of simple algebra. What is arguably the simplest form of this relationship is that a 1 volt source connected to a 1 ohm resistor will cause 1 amp of current to flow. There are other ways to say the same thing. A 1 ohm resistor with 1 amp of current flowing through it must be connected to a 1 volt source. A 1 volt source that causes 1 amp of current flow must be connected to a 1 ohm resistance.

No. By definition, a parallel circuit occurs when there is more than one alternative path.

All Moving Iron Type measuring instruments major rms value of quantities.

iron or water...almost any metal..i hear that iron is the best though

0.6-0.7 V for Si at room temp. and 0.3 for Ge at room temp.

by converting it on mp4

no

TIP120/TIP121/TIP122

NPN Epitaxial Darlington Transistor

• Medium Power Linear Switching Applications

• Complementary to TIP125/126/127

Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.

Transformers are rated in KVA, both the primary and secondary windings have the same KVA rating. (KVA is the voltage multiplied by the amperage then divided by 1000).

If you have a 10 KVA step up transformer with 120V on the primary:

A = 10k / 120 = 83.33A

and if the secondary produces 240V:

A = 10k / 240 = 41.667A

This depends on the IC, and package size. If you look in the data sheet for the particular IC you are wanting information about, there will be a page dedicated to the physical size and layout of the chip.

When electrons are given energy, they can "jump" to a higher energy level or "electron shell". It would then be in an excited state. When it returns, it will emit the energy in the form of an electromagnetic wave (light).

A good example is a simple filament lightbulb. Electrons undergo thermal excitation (excited by heat) and will emit a whole range of electromagnetic waves (in the visable region of the spectrum, but also a lot of lower energy infra red light)

Thevenin's theorem is a basic equivalence principle for circuit design. It can simplify a very complex circuit to a very simple equivalent. This is done by finding the Thevenin Resistance as well as the Thevenin voltage and current. Once these are known, the equivalent circuit is simply a voltage source in series with a resistance.

Parallel. Coz all the elements will get same voltages from the sources. in case of series connection, the voltage is divided between all elements.

Voltage drop

DC current will not pass through a transformer, in the sense that a DC current on the primary will not produce a DC output from the secondary. A constant DC current will not produce any output from the secondary but there may be transient effects as the DC current is connected or disconnected (in which case, it's really an AC current, isn't it?) More about this below because I don't think that's really the question. If you pass DC current through either winding of a transformer, two things will happen. First, you will heat up the transformer and, if you have enough DC current, you will burn it out. Second, you will induce a magnetic field in the core. The more current, the closer the core gets to "saturation" or the maximum field it can support. This is important if there is both DC and AC current present because the more DC field in the core, the less core capacity is available to "transform" AC current. As the core operates closer to saturation, the AC waveform will be distorted and some of the AC power will be lost to heating the transformer. For example, if the primary of a transformer is connected to an AC source, and a DC source is connected to the secondary, then the primary current drawn by the transformer will increase, possibly enough to destroy the transformer. There are special transformers, called magnetic amplifiers, which take advantage of this effect to use a DC current to modulate an AC current. There are transient effects of DC currents in a transformer winding. As the DC current magnetizes the core, energy is stored. When the DC current is disconnected, this stored energy wants to leave the core. It can do this by inducing a voltage in either of the windings. If both windings are open circuit, this voltage can be very high. So you may see a spark jump when the DC voltage is disconnected. In a large transformer, this discharge may break down the transformer insulation and damage it. Some switching power supplies take advantage of this effect in which case the transformer is wound slightly differently and called a "coupled inductor."

Depending on the value, it varies.

Using a multimeter set for Kilohms resistance, check that it appears open circuit. This may be hard to determine, due to other components in circuit. It should NOT show zero resistance.

Electrolytic capacitors above 1 microFarad will show some storage of charge.

Using the meter with the probes one way, there should be a percepible rise of resistance. Reverve the leads and you should get an intial negative value followed by a slow rise in resistance.

If there is no perceptible rise, it could be open circuit. If it shows Zero, it will indicate a dead short.

No electricity is transmitted to Andaman from mainland.In fact it is generated at each island with the help of diesel generators according to need of the particular island.However, power is transmitted from Kalpong hydro electric project(North Andaman) to middle andamanwith transmission lines of 33 KV.

Electrons have negative charges, and unlike neutrons and protons are located on the outside of the atom. They are generally located in electron clouds around the atom, and stay there because of their attraction to protons that are in the nucleus of the atom.