Electrical Engineering

it is a bad conductor of electricity. i checked it using the tester and the bulb did not glow.

The characteristic of the current sources is that it cannot operate in an pen circuit.

ampere hour is the unit of electricity consumed by electrical load,for example you are consuming 5ampere per hour so unit of power will 5amp-hour,generally unit of power is kilowatthour,so 1000amp-hour =1KWH ampere =voltage/resistance, amp-hour the unit of power on which tariff is calculated for the consumption of electricity

no

A person needs a motor when there is a need for mechanical energy with availability of a power source.

Yes, the minimum is three wires, usually used when the three phases are in balance, with equal currents in all three lines.

In conditions when the three phases might be unbalanced, a neutral wire is added, which makes it a 3-phase 4-wire system, and the current in the neutral depends on how out-of-balance the currents in the three lines are.

the unit of "e.m.f" is "volt"

Audio power amplifiers usually separate the last inductor in the output stage transmission chain. The last inductor usually receives the most attention when it comes to power efficiency in a circuit.

Since circuits experience opposition to current, especially where current is changing direction, capacitive reactance or opposition needs to be balanced with inductive reactance. This is done with the help of an output inductor for maximum output to be reached.

Output inductors are used to dampen circuit resonance with the help of a shunt resistor. This is especially important in high frequency circuits where stability is a real issue.

Power factor is the cosine of the phase angle between voltage and current. In a purely resistive load, like a toaster, since the phase angle is zero, the power factor is 1. In a theoretically purely inductive or capacitive load, with the phase angle at 90 degrees, the power factor is 0. Power factor is also the ratio of apparent power versus true power, or watts versus volt-amperes.

it's just like an GPS System but it's a different type and made from a different com[any.........lolzz

DC load flow is a method to estimate power flows through lines on AC power systems.

An accurate solution of the power flows on an AC system is a non-linear problem. Consequently it requires an iterative approach and there is no guarantee of reaching a "convergent" solution.

A "DC" load flow uses a simplified, linear form of modeling the AC system. Consequently its solution is non-iterative, and absolutely convergent. It becomes a routine algebra problem, solving multiple equations with multiple variables. It is inherently less accurate than a "full" AC load flow solution, but it is useful where fast, dependable solutions are essential, and the approximation is acceptable. In reality, there is nothing "DC" about a DC load flow. It solves for phase angles (an AC, reactive characteristic); it ignores resistance (a DC characteristic); and it ignores voltage (because the objective is just power flow). It probably derives its name from the similarity between this solution method and the method used to solve a DC system, which is also linear, non-iterative and absolutely convergent.

Parallel, series, and series parallel

no

It resist the flow of current according to the resistance value.

In India maximum generation is 21.5kv

The function of a CVT is to provide a secondary voltage to equipment that is a direct ratio of a much higher primary voltage. They can also be used to couple communication signals onto transmission lines.

Interlocks fitted to breakers suggest that a load is supplied from two separate sources. An example would be where one breaker is supplied from a utility source and the other breaker will be supplied from a generator source. To prevent both breakers from being on at the same time to supply the load, an interlock is placed across both breakers. This allows only one breaker to be on at a time. Manual interlocks allow a person to make the decision as to which power source will supply the load. Automatic transfer switches have built in interlocks and will sense where the source power is coming from. This type of system switches from one electrical source to another without any human intervention.

when the field winding of a running dc shunt motor suddenly breaks open the motor fails to run because in the motor the stationary winding is armature and rotatory is field winding

Power factor is the cosine of the phase angle between voltage and current. In a resistive load, current is in phase, i.e. with a phase angle of 0 degrees, with respect to voltage. Cosine (0) is 1.

You have to know 2 things in order to perform the calculation. You will need to know the power (KW) and either the amps or the voltage. If you know voltage you can determine amps and if you know amps you can determine voltage. However with solely the KW you do not have enough information to calculate either. Here is the formula:

1 Phase: KW = (E x I x pf)/ 1000

3 Phase: KW = (1.732 x E x I x pf)/1000

Where E is voltage, I is current, and pf is Power Factor

If it's a long, STRAIGHT bulb...grasp with both hands - one at each end of bulb, and gently TWIST bulb toward you until it comes free of lamp. Replace by gently TWISTING new bulb back in - but in the opposite direction (counter or clock wise). If the bulb is ROUND....simply unscrew it by gently turning counter clock-wise.

To calculate kWh from kW and running hours, you can use the formula: kWh = kW x hours. Simply multiply the power in kilowatts (kW) by the running time in hours to get the energy consumption in kilowatt-hours (kWh). This formula helps you determine the total amount of energy consumed by a device or system over a specific period.

define the maximum value of an ac wave form

Biasing-Application of suitable DC voltages to operate our amplifiers in desired region of operation(say active or saturation or cut-off region) complying our needs.However in order to maintain a constant Q point irrespective of various external factors,hence it again comes to the need for biasing that compensates the change in external factors suitably thereby maintaining a constant Q-point. Voltage divider bias or self bias is a process of suitably biasing amplifier by connecting two resistors in series in the answer. By proper selection of resistors R1 and R2, the operating point of the transistor can be made independent of β.