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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
Why is there less current in a circuit with four bulbs than there is in a circuit with one bulb?
yes because of bulb resistance :)
- A transfer corona it's a thin wire usually protected by other thin wire that applies a positive charge to the paper drawing the negative charge particle's on the paper.
Ohms law states that E=I * R, or voltage equals current times resistance. Therefore current equals voltage divided by resistance. 120v divided by 16 ohms equals 7.5 amps.
Why must you make current flow through the meter in order to measure it?
You don't.
...unless you want to directly measure the current in a circuit branch. That's the purpose of an ammeter.
You can also use a volt meter if you know the resistance of a resistor in that branch to determine current (assuming DC circuit here) - current = voltage / resistance. This may be more useful for circuitry that is on a breadboard, since inserting an ammeter may not be practical.
What is the minimum height for high power lines over a road?
On 11-66kV not less than 5,5 metres,with hazard signs on both sides indicating height of line.
What is the function of a coupling capacitor?
A coupling capacitor is used to block the flow of direct current while allowing alternating or signal currents to pass, hence mainly used for joining two stages in radio and amplifier circuits.
Also known as blocking capacitor or stopping capacitor. They are also used in substations within a "wave trap" where communication is done by a.c. power line and any d.c. signals need to be attenuated or blocked.
Why is a parallel circuit easier to repair than a series circuit?
A series circuit is like the old string of Christmas Tree lights. If any bulb burns out none of the others light because the circuit is now open. The same would happen if you used series wiring in a house. Another draw back is the number of devices in series governs how much voltage would be across each device.
When a switch is on is a circuit open or closed?
If the switch is what is keeping the load from turning on, then yes, there is a voltage across the open switch.
Why we want to improve the power factor?
The best way to improve power factor is by adding capacitors. Low power factor is due to reactive loads (motors, pumps, etc.) that are connected to your electrical system.
ADDITION
The best way to improve power factor in the case of motors is to use a motor drive, like a Variable Frequency Drive. These drives allow very precise control over a motor, unlike the very sudden, jerky starting and stopping across the line seen when using a motor starter. They eliminate the huge inrush current required to start motors that causes low PF.
Answer:1) Power factor can be calculated by connecting an energy meter [P] (voltage coil in parallel & current coil in series with the load), a voltmeter [V] across load and an ammeter [A] in series with the load. Measure P, V & I.
Since, Active Power (P) = V.I.Cosϕ
power factor = Cosϕ = P/VI
2) Power factor is usually (industrially) improved by connecting a shunt (parallel) capacitor bank at feeding end.
How it works??
Inductive loads contain both inductors and resistors. But due to phasor difference of coils and caps when voltage is applied across both, the two currents results in a smaller net current finally. So now the angle (ϕ) between the voltage phasor and current phasor is lessened. When ϕ is reduced, Cosϕ is risen resulting in a higher power factor.
In a series circuit the is the same at every point?
In a series circuit, components (such as resistors, bulbs, or other devices) are connected end-to-end so that there is only one path for the current to flow. Because there is only one pathway for the current, the same current passes through each component in the circuit.
This principle is derived from the conservation of electric charge. Since charge cannot accumulate or disappear in a closed circuit, the current that enters a component must be equal to the current that exits that component. In other words, the flow of current is continuous and consistent throughout the series circuit.
Mathematically, this can be expressed as:
I_total = I_1 = I_2 = I_3 = ... = I_n
Where:
I_total is the total current entering the series circuit.
I_1, I_2, I_3, ..., I_n are the currents through each individual component in the circuit.
It's important to note that while the current remains the same throughout a series circuit, the voltage (potential difference) across each component can vary depending on its resistance or impedance, according to Ohm's Law (V = I * R).
What is the difference between Kw and Kv?
The symbol, kV.A (not 'kva'), represents kilovolt amperes, which is the unit of measurement for apparent power -i.e. the product of supply voltage and load current in an a.c. circuit. The symbol, kV (not'kv'), represents kilovolts, which is the unit of measurement for potential difference.
What are the Pros and Cons of being a computer technician?
Positive aspects of becoming a computer technician include being able to fix your own computer. The job has room for growth, there is flexibility in career options, and computer technician jobs typically pay well.
When was the generator invented?
the AC electric generator was invente by Nikola Tesla. He invented in the late to early 1800's and 1900's. This idea was recently accepted by scienctists.
According to the website linked below, it was invented in 1663.
An electricity board will be fixed some amount of load for consumer (industry or commercial) as per consumers requirement.That is maximum load or maximum demand.
Work (W) is defined as 'energy in transit', and describes the conversion of one form of energy into another -for example, when an electric motor converts electrical energy into mechanical energy, it is doing work. The SI unit of measurement for work is the joule (J). Another commonly-encountered unit of measurement for work is the watt hour (W.h).
Power (P) is the rate of doing work. The SI unit for power is the watt (W) a special name, equivalent to a joule per second.
What diffaculties can occur in working relationships and how do you resolve them?
In some cases where its a long relationship what can be lost it the interest in talking to each other, a way this can be solved is just seeing each other more often. This happens often in teenage relationships. Another huge topic is the friends of the girl and or boy for example you can like each other but if the friends get in the middle nothing will workout. You have to understand that this is your relationship and not theirs. A problem that has happens to many couples is getting jealous when either the girl or guy is jealous it normally leads to being very over protective and it sometimes can be the end of a relationship, when this happens you need to talk to your other because this person may not know how your feeling. I hope this was help full your question wasn't very clear.
What happens to the current in a circuit when the resistance is increased?
The flow of electrons meets an increased impedance to it's flow.
How maglev trains are sustainable?
They're not.
They use a tremendous amount of raw materials, and large amounts of energy.
(just to hold itself up).
They are quiet - up to a point - but as they get faster the sound pollution goes up.
What are facts about maglev trains?
Advantages : they'd be wonderful on the moon OR in vacuum tunnels bored through the Earth.
Disadvantages : expensive, and by that I mean that their cost does not translate into savings. Like growing corn to make ethanol for fuel when the BTU's spent in fuel and fertilizer exceeds the BTU's you get from the alcohol.
Why is wind energy a good way to generate electricity?
It is a good way, because...
A) It decreases our dependence on OPEC,
B) It decreases our dependence on Arab countries,
C) It decreases our dependence on the increasingly expensive foreign oil,
D) The wind mill process is cleaner than burning coal,
E) The wind mill process is cleaner than burning oil, and
F) Over time, the value of wind mill generated electric power is greater than the investment we need for setting up and maintaining wind mills.
How are maglev trains better than average trains?
well maglevs are totally different from conventional. here are a few things that make them different: Magnetic Levitation Train:
-faster
-makes less sound
-floats on the track
-uses superconducting magnets
-no engine
-doesn't use fossil fuels
-much more costly
-relatively new compared to conventionals
-used to travel long distances
-transports people
Conventional:
-uses wheels and creates friction that causes sound
-uses fossil fuels
-does not cost as much
-slower
-used in more places
-used to travel long or short distances
-transports passengers and cargo
those are just a few things that makes maglevs diffferent than conventional trains.
Maglevs are powered by magnets, where as a regular train uses a motor and fuel/electricity.
Is the word North Star capitalized?
Yes, it is a word. I am almost completely sure it is the study of astronomy.
The time constant of a circuit that contains inductance and resistance follows what type of curve.?
1.cosine 2.exponential
3.min-max value
4.sine
