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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
How many potatoes does it take to power a 40 watt light bulb?
The potato-battery experiment only generates about 1.5 volts a few milliamps. For a 40W incadescant bulb you typically need 120V and about 330 mas. If you could control all your losses in circuitry and somehow group the potatoes in series you would need about 160 potatoes. Wire 80 in series and parallel that with another 80 in series. This will provide DC vice AC. You need the proper anode and cathode and proper gauge wire. 40W isn't practical application. Try smaller bulb for starters and work your way up.
A varactor diode is operated under reverse biased conditionwhy?
because reverse biased current is constant upto avalanche breakdown.
What are some features of an inverter generator?
Some features of an inverter generator are efficient use, easy use, long lasting use, and an overall great choice to choose. Inverter generators are also very quiet, making it more useful for houses that are experiencing power outages.
Most difficult course of electrical engineering?
Many believe that mechanical engineering is the hardest type of engineering. However, electrical and bio-medical engineering are also quite difficult.
An "AC suit on account" typically refers to an Accounts Receivable (AC) suit related to outstanding payments owed to a business. This legal action is taken when a debtor fails to settle their account, prompting the creditor to seek recovery through the court system. The suit may involve claims for the amount due, interest, and possibly legal fees associated with the collection process. Ultimately, the goal is to secure a judgment that compels the debtor to pay their outstanding balance.
A National Grid is a power or energy supply system for a nation. They are called this because the network of supply lines from various generating or storage sources forms a grid in a mathematical sense, as there is usually more than one supply line to most points (or grid nodes). This allows some redundancy in the system, to allow continuous supply despite temporary breakdowns on some parts of the grid.
National grids do not necessarily cover the entire country, especially in poorer or less populated areas.
The United Kingdom has a grid for the supply of gas and a grid for the supply of electricity.
The United States has three separate electricity grids, however they are not interconnected.
Australia has a National Electricity Market (NEM) based on a transmission grid connecting the eastern states of Queensland, NSW, Victoria, Tasmania and South Australia, however the distance to Western Australia means that it operates its own South West Interconnected System (SWIS).
How do you convert 12 volt 10 amps dc relay to 230 volt ac relay?
Unless otherwise specified, all a.c. voltages and currents are expressed in root-mean-square (rms) values. An rms value is exactly equivalent to a corresponding d.c. value. So, 230 V a.c. is exactly equivalent to 230 V d.c., and 10 A a.c. is exactly equivalent to 10 A d.c.
Incidentally, the symbol for volt is 'V' (not 'v') and the symbol for ampere is 'A' (not 'a').
What is the purpose of a capacitor in a circuit?
To store energy, in an electric field between separated charges.
(An inductor stores energy in a magnetic field surrounding a current.)
Can you convert an ac fridge to dc?
My husband said without hesitation AC!! DC power comes from batteries, AC power comes from electricity((generating power))....
A calculated load in electrical terminology is the sum of all of the loads that are connected to a system. To size a service distribution for a home all of the connected loads have to be calculated in. Some loads can be derated as per the electrical code. When the total amperage is calculated from the sum of all of the loads, the wire size and distribution can be sized to handle the calculated load.
What is the efficiency of 1.5 KVA inverter?
It can supply up to 1.5 kW into a load with a perfect power factor like a convector heater, or less if the power factor is less than 1. For example a motor might have a power factor of 0.75, then only 1125 watts could be used, in other words about 1.5 horse-power.
What is the Difference between a magnetic starter And a contactor?
Motor starter usually refers to the complete assembly, including enclosure, contactor, control transformer (if any), overloads, fuses (if any), etc. A contactor is really just an overgrown relay, and is just one component of a starter. That having been said, many folks use the two terms somewhat interchangably. So someone who says starter may mean contactor, and vise-versa. Go figure.
voltage!
measured in volts.
current X resistance = voltage
simple ohms law
A multi meter will allow you to directly measure resistance.
Ohm is the unit of resistance. It is given a capital letter because it was named after a scientist, it is someone's name.
You can measure potential difference and current and then use Ohm's Law:
V = IR
Where
V is potential difference in volts
I is current measured in Amps
R is the resistance measured in Ohms
Example: to test a resistor component, use insulated test probes and crocodile clips to hold the component because you will can get tracking of stray signals across your fingers which would cause errors in the reading..
A digital multi meter is very popular and availabale to accuarately test a resistor. It gives a digital readout eg, 100.00 Ohms, allowing you to read decimal places
where as a moving coil meter will depend on the user's eyesight to read the scale .
Why is 400 Hz used as an aircraft power supply?
Although most all utility power in the world use either 50 Hz or 60 Hz, 400 Hz power systems are typically used in large aircraft. The reason for the higher frequency is that most of the power system parts, especially the 400 Hz alternator and 400 Hz motors are much smaller compared with similar 60 Hz equipment of the same power rating.
In aircraft, every pound saved in equipment weight, equates to about a five pound savings in gross weight during flight. When equipment weight is reduced, both airframe structure and fuel load can also be reduced.
As flux is inversely proportional to speed and speed is proportional to frequency
Higher the frequency lesser the flux required.Lesser the flux,lesser the core size.Lesser the size means less weight.Hence the pay load can be increased.
Also frequency above 400 hz not taken because the radiation takes place beyond this.
What is the use of dielectric between capacitors?
A dielectric is an insulator between the plates of a capacitor. They allow us to build the plates closer together, without allowing them to short together, thereby increasing capacitance.
A light bulb in a simple circuit blows and goes out Is current now flowing in the circuit?
No. Circuit is open but still HOT.
What is the difference between MWe and MW in electricity?
MU is Amount of Energy uswed while Watts is amount of power delivered.
1 U = 1KW HR that is 1 unit is amount of power consumed by 1 KW Bulb when on for 1 Hr.
1MU= 1MKWhr=1BWHr
Which motor has a higher starting torque?
A series-wound commutator motor has the best starting torque because the torque is proportional to the square of the current, and the starting current is set by a current-limiting resistor which is switched out as the motor builds up speed.
In an AC circuit with only an inductor what will an increase in frequency do?
Inductor impedance is given by jwL, where w=2*pi*frequency. Therefore as the frequency increases the impedance of the inductor increases, causing a larger current flow and a larger power dissipation across the inductor
