Electrical Engineering

P=ie

Yes, a diode inherently has polarity, as current is only allowed to flow one direction.

a: its function is to detect a change of light withing its perimeter

250 kVA generators come in different voltage settings and this information is needed before a wire size can be given

A sine wave centered at zero will have a positive peak that is the same magnitude as the negative peak. This can be offset so the negative peak magnitude does not match the positive peak magnitude. For example a 1volt peak - neutral sine wave could be DC offset by 1 volt so the positive peak is at 2 volts and the negative peak is at 0.

Step-Up Transformers increase the primary voltage to a higher voltage, of same frequency.

A: The essential difference is while it will behave like a normal diode at some at .6 forward voltage it has a negative impedance area before this point is reached it is not a very stable area to maintain and has the tendency to switch from one mode [low level] to the other .6v and very fast endeed.

For a current to flow between two points, those points must have a potential difference (voltage) across them.

v1= h11 i1 + h12 v2

i2= h21 i1 + h22 v2

To calculate h11 and h21 short circuit the output terminals & to calculate h22 and h12 make input open. Substitute values in the above equation to find h parameters.

An ammeter has to measure to current flowing through the circuit. Resistance offers an obstruction to the current flow. So, if the resistance of an ammeter is large , the current measured by the ammeter will be quite less as compared to the actual amount of current flowing through the circuit which is undesirable. If ammeter has zero resistance , then it will give the exact value of current. But this is not practically possible because every material has some value of internal resistance which we can't control. For this reason , ammeter must have small resistance

There is a lot of variation in the applied DC voltages that operate an electrostatic precipitator (ESP). Some work on a few thousand volts (a few kV), while big industrial units might run on upwards of 100,000 volts (100 kV).

A loss of field relay.

Current or AMPS are what the appliance draws or load of the appliance. So, if you have a say 10,000 amps going thru a cable rated for say 1,000 amps , guess what ,the cable over heats and either will melt or at least catch fire.

Yes, the two things that chage the number of flux lines in a transformer(electromagnet) are the number of turns in the windings and the amount of current flow

A: LED follows an exponential curve just like a regular diode. However their make up moves the forward voltage from 1.8 volts to 3.2 volts and higher this differs from a regular diode where is the forward voltage is around .6 to.7 volts. Because of the higher voltage across these devices they cannot dissipate much power.

A galvanometer with a low resistance shunt in parallel makes an ammeter.

This system is used to generate an environment that is anaerobic for microorganisms. The strip will let you know when the oxygen has been used up.

> Predetermination of regulation.

> Predetermination of efficiency.

> Less power loss.

There are several formulas to find out leakage current, but one is the general electric current equation. This electric current equation is I=Qt.

A; Mathematically presented how else can you represent a RATIO

V=ir

The only difference is the maximum repetitive capability which is maximum for IN4007 compared to OA79

Sure if it fits and meets other specs like operating temperature.

Because the meter is connected backwards

proof load testing is to try to find the % at which the equipment can lift over the safety working load.