Electrical Engineering

induced voltage can produce extremely high voltages that can be lethal if proper precautions are not observed such as earth grounding.also all coils of wire are inductors as are transformers .it is also very probable that fuses will blow,and a potential for a fire or even an explosion is a possibility! hooking up unknown electrical components and then powering them up can be risky business,especially if you don't have any electrical knowledge.

Electrical wire size is directly dependant on the load amperage that is connected to it. The higher the load amperage, the larger the cross sectional area of the wire needs to be. The connected amperage to a conductor is determined by a group of electrical experts and their results are then written into the latest addition of the electrical code book of the country in which you live.

In house wiring you have hot (Black), neutral (White) and ground (Bare wire).

because if we hadn't had any bulbs then we couldn't have light we cant see anything

if you connect the pumps in series, it will add head at the same flow rate. Inversely, in parallel connection, double the flow rate at same head.

Basically anything that works with batteries usually works with DC motors, i.g. your hard drive, your cellphone vibrator, toys, etc.

Also, even for large motors, the DC motor has the advantage of being easily controlled by input voltage. Induction motors, on the other hand, can use controlled input voltage but they will have to deal wth low torque when the voltage is low.

DC motors are used for those little fans in your computer. Also, CD players also use DC motors to spin the discs. DC motors are important where absolute speed control and feedback are necessary.

For your household appliances, including fan motors, those are AC motors, cheaper for the industrial strength and more efficient.

Ohm is a unit of measurement for resistance. The term ohm was named after a German physicist named Georg Simon Ohm.

This vector group test is done to confirm whether the vector group provided in the name plate is correct or not and also to confirm that the winding has not been damaged during transport, installation and erection.

Taking a particular example, for Dyn11 transformer we have to apply 3~ 400v to the primary, with primary 'U' & secondary 'u' shorted....

then check the voltage across different terminals such as V-v, V-w, W-w, W-v

for Dyn11 configuration (V-v = V-w = W-w)less than W-v....

you can compare the results after drawing the vector diagram for the same......

the purpose of shorting the primary U & secondary u is to nullify the phase shift, to obtain a reference vector...

When dealing with a 3 phase power supply the safe clearance zone between each phase is usually within an arms reach, there are exceptions to this rule like a 3 phase socket or a distribution board.

9 megawatts a year

The use of armoured cable is determined by the application that needs an electrical source of voltage. It is a metal sheath cable classification. Armoured cable is used in applications that need mechanical protection usually below a certain elevation. Armoured cable is also usually used on surface wiring. If you have access to an electrical code book there is a whole section on armoured cable. In the CEC the section about armoured cable starts at 12-600 to 12-618.

A capacitor resists a change of voltage, proportional to current, and inversely proportional to capacitance.

dv/dt = i/c

Capacitors can do various things. They can filter out high frequency transients, or power supply ripples, they can block DC while passing AC, they can participate with other components such as resistors and inductors to form filters - the list is endless.

If you have a high input going into the inverter it will have a low output and if you have a low input going into the inverter it will have a high output, the bottom line is it's output is the opposite of the input.

A very very tiny amount of the current that would normally flow through the resistor instead flows through the voltmeter, allowing it to make its measurement. For most purposes this very very tiny amount of current can be completely ignored.

Ammeters are added in series to the circuit to be monitored.

Insulation of laminated core is required to reduce the circulating current points due to touching the two plates. This results in more iron loss and heat produced

These terms apply to the coils inside a wattmeter. 'Pressure coil' is an archaic term for 'voltage coil', which is connected in parallel with the supply, while the 'current coil' is connected in series with the load.

The resistors each have a value of 20 ohms. The way to discover it is to apply Ohm's law. It (Ohm's law) comes in 3 "flavors" that look a bit different but all say exactly the same thing. Here they are: E = I x R [Voltage equals current times resistance.] I = E/R [Current equals voltage divided by resistance.] R = E/I [Resistance equals voltage divided by current.] In these equations, voltage is E, current is I and resistance is R. They are measured in units of volts, amperes (or amps) and ohms, respectively. Your problem gives us an applied voltage of 8 volts and a current flow of 0.2 amps. The formula that probably works best is R = E/I for this one because you have volts and amps. In this case, R = 8/0.2 = 40 ohms. But that's the total resistance in the circuit, and you said that a pair of equal resistors are connected, so the pair of resistors has a total resistance of 40 ohms. The rule for finding total resistance for resistors in series is that we add them up. R1 + R2 = 40 ohms. And since R1 = R2 here, 2 x R1 or 2 = 40 ohms, and R1 or 2 = 20 ohms. Either resistor has a resistance of 20 ohms, and that means they both do. Easy as pie.

pipe earthing is done outside the tower, a hole of required diameter and depth is excavated and a pipe filled with coke and salt is put inside that hole which will be connected to the earth strip eventually connecting to the foot of the tower.

The other method of tower earthing is counterpoise in which galvanised strip of wires is connected to the foot of the tower and is being earthed to a depth at some distance.

Hope this answer work for you..

mohit sharma