Electrical Engineering

mega = 1,000,000

1MHz = 1,000,000 Hz.

workdone on unit postive charge by bettary is called electro motive force .it is not a force but traditionaly used as force to carrying charge from lower potential to higher potential.

when current change in a coil then megnatic flux is change due to which emf is induced .

this emf is a effect of changing current while electro motive force is a work donr by bettary to carry out the current in a wire

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Large transformers are filled with oil which circulates to a radiator to get rid of excess heat. A 100 MVA transformer should waste about 1 MW of power on full load, 0.5 MW on no load.

No. For more information please see the answer to the Related Question shown below.

i=v/r

Z tranform can be used to solve the differential equations occurring in electrical problems.

If the primary is 1 and the secondary 200 then multiply the primary voltage by 200.

A zener is a diode that has the property when reversed bias to breakdown at a specific voltage this voltage will remain constant as current increase. It is important to be aware that the diode will need to dissipate heat while it is operating. The power is the current flowing through the diode multiplied by the voltage across the diode. For zener diodes with a high reverse breakdown voltage, it can be seen that a lot of power may need to be dissipated for a relatively low current.

We can use the constant voltage as a reference voltage. Either a component can be powered directly from the reference voltage created or additional components can be used to increase the available current.

To manage energy.

1. Two Sets of Three

2. A set of three run of four

3. Set of Four run of Four

4. Run of 7

5. Run of 8

6. Run of 9

7. Two sets of four

8. Seven Cards of one Color

9. Set of 5 run of 2

10. Set of 5 Run of 3

Completely from memory :)

Actually, Phase 9 is set of 5 and set of 2...Phase 10 is set of 5 and set of 3

Since inductive reactance is 90° out of phase from pure resistance, this can be calculated like the hypotenuse of a right triangle. Sqrt( 172 + 62) = 18.028 Ω

The angle is 70.6° lagging.

in modern trend, synchronous impedance of alternator should be high. If impedance are more than voltage drop across its arm. Wdg. Is more .according to the phasor diagram of alternator if IaXs componant is more than magnitude of induced emf will also be increased.

Using ohm's law v=IR but we need to find the Resistance so, in place of v write r R=V/I

A sensor that is activated by a lack of light (the dark). Usually these can be found in night lights that turn on when the lights are turned out.

One of the conditions that would cause this is that there is no supply voltage to the top of the meter. Another problem could be, the neutral tickler wire has become disconnected.

It has been some time but here goes.

The circuit breaker size can be found when some other information is given. For a given voltage value, the size of the cb is basically found using the formula

P(Kw) = IV here the value of I is approx the value of the circuit breaker. The solution is not so simple since there are normally tolerances set by the different regulator organisations as to these values.

Another situation to consider is the type of current and voltage you are using ie ac or dc, Vac or Vdc. also the amount of phases if it is ac voltages we are considering . If 3 phase ac voltage and current the formula used is as follows

P(kva) = 1.73 x IL x VL x pf where pf , the power factor is the introduced and kva the apparent power is used instead of kw here because under most conditions a power factor of 1 cannot be achieved. IL and VL are the line current and voltage.

Gladstone

When there is an inductive element in the circuit, the current lags behind the voltage. an ideal inductor will make the current lag behind the voltage by 90 degrees..

a capacitive element on the other hand will make the current lead the voltage (ideally by 90deg). That's why capacitors in parallel with the system are used a lot for power factor correction

It represents an association between two values numerically.

I will assume this is a question on AC power into a building. That is referred to as a brown out.

That is because they are of the form

y = a1x1 + a2x2 + ... anxn where x1, ... xn are variables and a1, ..., an are constants.

Such an equation represents a straight line in n-dimensional space.

in order to avoid equpement and damage.

you need test to see if it is right or wrong. You also need to test 10times maybee to make sure it's right or wrong. you need test to see if it is right or wrong. You also need to test 10times maybee to make sure it's right or wrong.

yes