Electronics Engineering

An embedded system has historically been defined as a single function product where the intelligence is embedded in the system. It could be anything from a dishwasher to a hearing aid, if that product includes a microprocessor and software. Many of today's embedded systems are looking more like PCs with user interfaces, touchscreens, displays, keypads and more. Still, these are not general function systems but are designed to perform very specific functions.

Squirrel cage motor

A diode is a solid state passive device that will only allow current to flow in one and only one direction (Anode->Cathode). A Thyristor behaves exactly like a Diode except that in order for current to flow it must "see" current at its gate, if it does not see current (ie logic 0 or ground) then current is not allowed to flow from its anode to cathode.

Note: The Thyristor gate requires little current to trigger its gate, meaning a small amount of current can be used to switch on/off a load require much more current.

Another Note: Since the Thyristor has a gate which controls its output it is not a passive device like the diode

Transistor or vacuum tube.

the J & K are just arbitrarily chosen letters and therefor have no "long form".

In what sense? In transistor jargon, p stands for positively doped type and n for negatively doped semiconductor. Another terminology used in mobile games is Pass 'n play.

in the Moore finite state machine model output depends only on the present state.

but in the mealy model the output depends on the both present state and the input.

this is the main difference

Capacitors and Inductors theoretically consume no power. In real life, they only consume power because they have an internal resistance.

In physics, power is the rate at which energy is transferred, used, or transformed. The unit of power is the joule per second (J/s), known as the watt (in honor of James Watt, the eighteenth-century developer of the steam engine). For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts-the more wattage, the more power, or equivalently the more electrical energy is used per unit time.

Resistance of stator winding is the resistance of the copper conductors being used for building the windings of three separate phases, i.e. R-Y-B. These windings are marked like U1-U2, V1-V2 & W1-W2 at the motor terminals (6 nos.) for the three phases, i.e. R-Y-B respectively. We have simply to measure the resistance of each winding by using a multimeter by connecting the terminals (2 no.) to U1 & U2 and so on.

The resistance should be in ohms not milliamps [amps is form of measuring current not resistance] milliamps to microamps in case of large motors, it may be in amps in case of small sized motors. But resistance of each winding should be nearly same to each other. This shows the electrical balance among windings & also proves the healthiness of the winding.

22ma. E=R/I

3 Kv = 3,000 volts.

The ratio of RB1 to RBBO is the intrinsic standoff ratio. It is the standoff voltage ratio to the power supply voltage.

Unipolar full step Stepper motor: _ _

INPUT SEQUENCE: X Y X Y

1 1 0 0

0 1 1 0

0 0 1 1

1 0 0 1

8255 CONTROL WORD: 1 0 0 0 0 0 0 0 =80H

PROGRAM:

MVI A, 80

OUT port B

START MVI A, FC

OUT port A

CALL DELAY

MVI A, F6

OUT port A

CALL DELAY

MVI A, F3

OUT port A

CALL DELAY

MVI A, F9

OUT port A

JMP START

DELAY LXI D, 0003

CALL DELAY

RET

A: A circuit to be useful to do work must be stable with the environment and also with reliable circuit performance. A circuit that is allow break into oscillation or other criteria is not stable therefore not much useful.

When we bring a positively charged body towards a negatively charged body the negatively charged particles in the negatively charged body move towards the positively charged particles in the other body i.e an electric charge moves when we bring two bodies of differently charged bodies or the same charges(they repel each other in this case)

A square wave pulse generator is the most commonly used generator. It is mainly used in testing different equipment. It outputs square waves that varies between two levels, with a 50 percent duty cycle.

Electrical signals are either direct current (DC) or alternating current (AC).

For DC signals, information is carried by the existence of a DC level, or it's absence. This is binary signalling, and communicates either a '1' or a '0'.

An AC signal conveys information by either changing one of the three properties that AC signals have:

1) changing the amplitude of the signal (this is amplitude modulation, like an AM radio)

2) changing the frequency (this is frequency modulation, like an FM radio station)

3) changing the phase of the AC signal. This is used in the faster of the old-style computer modems, as well as DSL modems

Conductance is the reciprocal of resistance, and is measured in siemens (S).

So a 5.1 ohm resistor has 1/5.1 conductance,

which is approximately 0.196 078 431 372 549 019 607 843 137 254 9 S.

It must (i) increase, or (ii) decrease, or (iii) stay the same.

If (iii), there's no point in having it at all,

so consider what happens to stage gain at the lowest frequencies, as the capacitor has less and less effect on the circuit.

DC input refers to the direct current electrical input provided to a device or circuit. Unlike alternating current (AC), which periodically reverses direction, DC maintains a constant voltage and direction, making it suitable for many electronic devices, batteries, and power supplies. DC input is commonly used in applications like batteries, solar panels, and electronic circuits where stable voltage is essential.

The color bands show the nominal resistance. The actual resistance is within some percentage (tolerance) of the nominal resistance, so the measured resistance is close to the nominal but not exactly the same. Also resistance varies with factors like temperature and age of the device.

The potential barrier in silicon is higher due to its relatively larger energy bandgap compared to other materials, such as germanium. This bandgap, approximately 1.1 eV for silicon, requires more energy to excite electrons from the valence band to the conduction band, thus creating a larger potential barrier for charge carriers. Additionally, silicon's crystal structure and doping levels influence the height of the potential barrier, affecting charge transport properties in semiconductor devices.