Electrical Engineering

Ammeters measure the current flowing through a circuit

each is a unit of measurement.

Horse power in the United States, watts everywhere else.

A generator.

High Voltage AC.

For maximum power transfer, source resistance should match load resistance and source reactance should match load reactance with the opposite sign (so if the load is capacitive, the source should be inductive).

The auger is like a big screw. As the screw turns pellets travel from supply bin to fire along the shaft. The auger turns because it is connected to a motor that is geared down from its rotational speed to a slower speed so pellets are delivered in a timely way to the fire and not shot like bullets out of the stove.

You can not have a "neutral earth" the "neutral" and the "earth" are separate wires/connections and should not be cross connected or muddled up.

3 times

orange

P=IE

What voltage (E) will be dropped across the resistor? Current (I) = .090 A

Assuming 90 VAC dropped across the resistor, then P=90 x .090 which = 8.1 Watts.

A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.

A Bucholz relay (device) is used where oil filled transformers have an overhead Conservator tank (to allow for the oil expanding and contracting due to temperature rising & falling) This device is fitted on the pipe linking the transformer tank to the conservator tank. The entry point of this pipe to the transformer should be the highest point of the main tank thus collecting any gases generated within the transformer. The outgoing pipe to the conservator tank is close to the bottom of the Bucholz device so as to accommodate the accumulation of any gases. These gases can be be drawn out and analyzed to give some indication as to the health status of the transformer core. The Bucholz device has two windows so as to allow the presence of gas to be verified visually. A small amount of gas trapped here will cause an internal float to fall and this can initiate an alarm. A second sensor is an internal flap which allows modest flows of oil up and down as heating and cooling. However a large volume of oil being forced through this flap will activate the flap and this can signify an internal fault. This signal is usually used to trip the circuit breakers on both windings so as to isolate the transformer immediately and possibly limit the damage.

Lt cables has own impedance which reduce the short circuit fault level

when we look at the curve ,, we can see that before the peak point curve has greater slope as compared to the slope after the peak point .. the reason is PL is given as I^2RL ,,, current is a squared term here . before peak point current is greater so overall change in power is much greater but after peak point RL is greater and current is less now the load resistance is not a squared term... so slope will be less. therefore the curve is not symetrical

Looking for a voltage drop.

5 ohms in parallel with 20 ohms is 4 ohms. 4 ohms across 200 volts is 50 amperes. However, resistance is a function of temperature, so the 4 ohms will probably be higher, reducing the current. How much depends on the temperature coefficient of the loads.

You can't have a three phase earth fault, you can have a phase to phase or a phase to earth fault. If you want the potential phase to earth fault current it will be your voltage times your impedance. If you want the phase to phase potential fault current then you should just double the above result.

Both technicians are right, and both technicians are wrong, because not enough information is present in the question, nor in their statements.

Given constant impedance, current should decrease as voltage decreases, while given constant power, current should increase as voltage decreases.

To test polarity on a boiler set the meter to loop, touch the two leads together, and it will buzz or read as "000". This will show you the polarity as well as test for continuity.

The Geiger-Meuller detector operates in avalanche mode, meaning that each ionization interaction results in a full pulse on the detector. Each pulse, then, is not proportional to the energy of the original event, making this not useful for determining absorbed energy. If you want to do that, you need to operate in linear mode. Its not just a case of reducing the operating voltage, as material, gas, and geometry are a factor in deciding which end result is more important.

The energy comes from an additional power source, like a battery. Via various resistors and capacitors, the energy from the power source is put into the circuit. The signal that enters the ciruit will exit the circuit with a higher energy; the signal has been amplified.

iron,gold

Assuming there is one reference mark on the rotating object to start with, a strobe tuned to exactly one half times RPM will show only one reference mark, i.e. one every other revolution.