Electronics Engineering

An AC adapter adapts the device that one wants to power up to the AC line. That means it converts the AC line voltage to something that can be used by the device in question. An AC adapter converts AC to DC. (In contrast, a device that runs off DC and makes AC out of it is called an inverter. An example of an inverter is the device that plugs into a vehicle's cigarette lighter and has an outlet on the other end that will permit someone to plug something like a kitchen blender into it. Great for tailgating! Don't run your vehicle's battery down....) There are times when an AC adapter is the little plug-in-the-wall thingie that converts the AC line voltage to some lesser value of AC. There are a few devices out there (usually older ones) that used their AC adapters to step down the wall voltage (115 volts AC) to 24 volts AC, 18 volts AC, 9 volts AC, or anything like that. Some new sprinkler control timers use an adapter that is an AC -to-AC step down converter. By looking at the information on the adapter, the user can see what the primary voltage is (and it's almost invariably 115 volts AC or 120 volts AC - same, same for this application) and what the secondary voltage is. As stated, the secondary is almost always DC, and if it is, the polarity is almost always indicated as well. That's so a user can tell if that little round connector has positive on the inside and negative on the outside or the other way round. (It makes a lot of difference to the device on which it is used, as one might guess.)

To increase the range of an ammeter, you connect a very low impedance resistor in parallel with the ammeter.

There are two ways to look at current.

Conventional current (measured in amps) flows from positive to negative. This model works for the vast majority of electrical engineering purposes.

However, current is created by the movement of electrons. Electrons have a negative charge so electrons moving in one direction will give rise to conventional current in the opposite direction. Therefore, although current flows from positive to negative, electrons flow from negative to positive.

In a parallel circuit nothing would happen. All the other light bulbs would remain on since there is an alternative path for current to flow. In a series circuit the entire circuit would be de-energized and all the bulbs would go out.

When leaving a dock, a vessel should use one short blast of the horn to signal its intention to depart. This sound signal indicates to other vessels that the boat is about to move away from the dock. It's important to ensure that the maneuver is safe and that the way is clear before proceeding. Always be aware of local regulations, as they may have specific requirements for sound signals.

Ammeters have a low impedance, so if they are incorrectly connected in parallel to your load instead of in series, more current will flow through the circuit and the ammeter will almost act like a short. There is potential to burn our the ammeter.

An Electronic Device

The sine wave is the curve that naturally occurs when the restoring force is proportional to the displacement. The math is a little complicated (the sine wave in this case is the solution of the corresponding differential equation), but the point is, this relationship between the force and the displacement is a fairly common situation.

The basic function of IC 741 is amplification. It is mainly used to magnify amplify weak signals inside a circuit.

A signal representation of 4-20ma is common because it does not require a lot of power - using a typical 24 volt power source, the resistance to deliver 20ma is only 1.2 KOhms and the power is only 0.48 watts - and, by offsetting the low end to 4ma, the receiver can detect an open connection.

Normally, a 4-20ma current loop is connected with a twisted pair cable, with both the current source and the current sink on one end. This way, you get good common mode rejection of noise. Using a differential amplifier with, say, a 10 ohm receiver resistor, you only need a delta voltage of 200 mV, so you can still have a substantial common mode range, typically, + or - 12 volts.

It's a "quad, 2 input nor gate".

To understand the significance of a "nor" gate, you need to understand a little about digital logic.

An "or" gate takes 2 or more digital inputs and if either is "on", the output will be on. (asserted high).

A "nor" gate inverts the output of the "or" gate, meaning that when either of the outputs are "on", the output will be "off" (asserted low).

The two input part of the description just indicates that it only accepts two inputs.

So, simply stated:

If either (or both) input(s) of a quad, 2 input nor gate is (are) asserted high, the output will be low. If both inputs are off (low), the output will be high.

That is related to the fact that the electrical forces are basically transmitted at the speed of light. This allows the current in a wire to travel at about 2/3 the speed of light in a vacuum, despite the fact that individual electrons move much slower than that (and the drift speed of a current is typically less than a millimeter per second). What happens here is simply that one electron (or other charge-carrier) transmit the energy to the next one, via electrical forces.

Varying the resistance of one branch of a parallel circuit will vary the current through that branch without affecting the currents in any of the other branches. As the supply current is the sum of the branch currents it, too, will vary.

A charge in motion is usually called an electric current, but could also be called dynamic electricity (analogous to a charge at rest being called static electricity).

Programmable Logic Controller (PLC) or programmable controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines.

public limited company.

Do you mean the steps are the same, or the power plants? The last step in a power plant is to transform the generator output voltage up to the main transmission line voltage. However I'm not sure if that is what you have in mind. If not, reformulate the question and re-submit, preferably in 'Electrical Engineering'

There are no pictures in electric circuit, only symbols, so an example does not exist.

In a electronics schematic diagram, a resistor is symbolized by a zig-zag line. The unit of resistance is measured in ohms, written with the greek letter omega.

Because metal and plastic arent the same materials so metal goes with the flow through static electricity but plastic cant.

Mcb, mccb