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Circuits
Overachieving and under-appreciated, circuits are the foundation that our technological society is built on. Now's your chance to find out not only how they work, but why. Questions regarding the physics behind voltage, resistance, capacitance, inductance, transistors, LEDs, switches, and power supplies; and how they're used to create analog and digital circuits, should be directed here.
1,646 Questions
What is the difference between voltage ang current?
voltage: it is the potentail difference between two wires. or it is the amount of energy used to force the electrons.
current: it is the flow of free electrons.
by Balaji,NITC
AnswerThere is no such expression as 'potential voltage'. 'Voltage' is simply another word for 'potential difference'.
Can you replace mosfet with an bjt transistor?
A MOSFET (metal oxide semiconductor field effect transistor) can be used INSTEAD of a BJT (bypolar junction transistor, so transistor is redundant in your question), if the circuit in question is modified to allow it and the MOSFET is chosen appropriately. BJT's will usually have a higher intrinsic gain, but have lower input resistance. Also a BJT in general will work better at higher frequencies than a MOSFET (unless you choose a high frequency MOSFET) due to the capacitive nature of MOSFETs.
What are the advantages and disadvantages of a double pole circuit?
A double pole switch can be used in either a 240V application where you'll need to disconnect 2 "hot" lines, or it is useful when switching a light from 3 different switches.
Disadvantage?
I suppose it could be a little confusing to face all those contacts on a double pole switch.
Does closing a switch allows electrical charges to flow in a circuit?
Closing a switch makes a closed circuit
Opening a switch opens, or breaks the circuit
One horsepower is equivalent to 746 watts ( = joules of energy per second) or 550 ft.lb (force) of work per second.
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The horsepower or hp is the Imperial unit of measurement for power.
"Power" is the scientific term used to describe "capacity to perform some work".
These days, in most countries, it has been replaced by an SI unit, the watt (or, in practice, kilowatt).
The term brake horsepower refers to the rated output power of a machine, which is not to be confused with the amount of input power it requires to be able to generate that amount of rated output power.
In the case of a car engine, the brake horsepower (or kilowatts) is the power remaining after all the losses have been taken into account. (Heat emitted, gearbox friction, etc.) In other words, output power (brake power) is input power minus losses.
For more information see the Related link shown below.
How do you determine high resistance by ballistic galvanometer?
http://books.google.co.in/books?id=Y-ruqUWv5UIC&pg=PA157&lpg=PA157&dq=ballistic+galvanometer+leakage+method&source=bl&ots=ZNigwuasnM&sig=KPDIj8E3asAS2xuNjSurDIB3fAA&hl=en&sa=X&ei=6oc8UZ_qIMfPrQf6ooCIDQ&ved=0CD0Q6AEwAw#v=onepage&q=ballistic%20galvanometer%20leakage%20method&f=false
The initials, IC, simply mean that the op-amp is made inside an integrated circuit. Op-amps have a total of 8 pins, and out of those 8 pins, 1 is inactive( pin no. 8) and 7 are active. 4 of the pins (2, 3, 4, and 7) supply the output, and one of the pins (pin 6) observes the output. So 7 means 7 active pins, 4 means 4 inputs, and 1 means 1 output.
The main advantage is that the 74ls193 can count either up or down, where as the 74ls163 can only count down.
However, if you are asking about the 74ls93 instead of the 74ls193, the 74ls93 has a divide by 12 counter which the 74ls163 does not, but the 74ls93 isn't a synchronous counter so I assumed you meant the 74ls193.
What are the advantages and disadvantages of sequential circuits?
A An IC has only limited points to probe troubleshooting, a circuit which is discrete in essence have all the nodes available, however the IC has the advantage of small real estate requirement for the same function
What is the best way to describe the function of a typical transistor in an electronic circuit?
A transistor in a circuit can do many things. It can be used to amplify voltage signals, or current signals, create current and voltage sources, make buffers, and so on. Transistors also find a major use in logic circuits (ie, where signals can either be a '0' or a '1'), where they essentially act as a switch, and can be used to create inverters, AND gates, OR gates, and all sorts of useful components.
By itself, a transistor is a three-terminal device that can control the current going through two of its terminals through the voltage applied at the third terminal.
But there are many applications for a transistor in its many different configurations, which is why it is so important in modern electronic technology.
What components can be include in integrated circuits?
Except coils (inductance) all other active and passive devices could be included in an ic
How does a speaker work in a circuit?
They will either pull in or push out depending on the polarity of the DC voltage and remain stationary.
This is a bad idea as the DC resistance of the voice coil is much less than the AC impedance of the voice coil and it is possible to overheat and burn out the voice coil due to the much higher current the DC voltage can produce in the voice coil compared to the AC voltage that would drive the voice coil in normal operation.
What is ceiling voltage in exciter?
ceiling voltage is the maximum field voltage that the exciter can withstand before going into unstability
What is true concerning a simple electric circuit?
The simplest form of an electrical circuit is when an energy source (such as a battery) is connected to a load (such as a light bulb or a resistor). The connections must be made in such a way as to allow the energy to flow from the source, through the load and back into the source to form a loop.
What are the disadvantages in using a series circuit?
Series:
It is impossible to control the bulbs individually. This is one reason that series circuits are not practical for use in home lighting: It is not possible to control the lights in different rooms throughout the house on the same circuit. For example, if someone wanted to read the newspaper or watch television, he would have to turn on a switch that would put on every light and electrical appliance in the whole house.
Also, in a series circuit, the more output devices you add the slower the current becomes. If these output devices were, for example, bulbs, this would mean that the brightness of the bulbs would be dimmed. Another disadvantage of a series circuit is that if a bulb were broken or the pathway broken in any way, the other bulbs would go out too.
Advantages are that you can add more power sources, like batteries, and increase the force of the output which grants you more power. In Parallel, however, the power stays at the same voltage of the original power source. For example, if you were running a circuit on a 5-volt battery and it kept the bulb going for two hours and then added another 5-volt battery, it would keep the bulbs going for four hours instead, but it would only give out 5-volts instead of increasing it to ten.
Parallel:
Advantages would be that, if it were light bulbs that were the output devices linked in parallel, if one bulb broke the others would continue going. Also, the brightness of the bulbs would be greater than the brightness of bulbs in series.
Disadvantages are that there could be a risk of fire in some cases. Another would be that, if you have multiple power sources, the power stays at the same voltage as that of the single power source. In parallel, increasing the number of output devices does not increase the resistance like it does in series.
What component is used to change alternating current to direct current?
Youd need at least a rectifier and to flatten the ripples you need a capacitor.
Which integrated circuit chips are used in a modern computer?
The microprocessor is the most common integrated circuit chip that is used in modern computers. The microprocessor is a multipurpose, programmable device, and processes data according to instructions stored in its memory thus providing the results as output.
What happens when a wire is looped into a coil?
When you wind a current carrying wire into a coil, it causes the concentration of the magnetic field line to intensify. Depending on which pole of the magnet is in the up position, the wire will move towards or bend away from it.
How do electric currents form?
The magnetic field means there is a charge surrounding a body.
Similarly if we move so much of charge (say electrons as in electricity) we can form a magnetic field.
These electrons if provide sufficient charge around a body magnetic field can easily be developed.
When a resistive AC circuit contains inductance the total opposition to current flow is called?
The resistance of an a.c. load is called 'resistance' (R). Resistance is not affected by frequency, only by the cross-sectional area, length, and resistivity of the conductor. Having said that, because of the skin effect, which causes an a.c. current to flow closer to the surface of the conductor, the effective cross-sectional are is reduced, so the value of a.c resistance is somewhat higher than the d.c. resistance -this difference increases with frequency.
The opposition to a.c due to inductive or capacitive loads is called reactance (inductive reactance or capacitive reactance), and the overall opposition to a.c. current is the vector sum of resistance and reactance, and is called impedance. That is:
(impedance)2 = (resistance)2 + (reactance)2
Why must do the insulation testing in circuit?
Insulation resistance testing involves applying a voltage across a dielectric, and measuring the resulting current and resistance. However, in order to get a proper reading, any electrical charge still within the system needs to be taken out, so as not to mess with the readings.
Do all current carrying conductors emit electromagnetic waves?
No. Only those carrying AC. Those carrying DC have a constant magnetic field around them and emit no waves.
When a circuit is opened what happens?
Nothing. An open circuit means no current is flowing. When the circuit is closed, current flows, the filament of the bulb is heated by the current and glows, giving off light. But when the circuit is open, nothing happens.
What color code is used for 4160 volt labels?
Wow your in some serious stuff. Are you worried about rotation. 4160 is not something to be messed with if your not a qualified electrician or lineman. If you mess up you can have a big fire ball on your hands.
A series circuit is one that is hooked up one component after another. Think of a baseball club holding hands. A paralell circuit is one in which the components are hooked up while sharing connection points. - Think of a marching squad coming at you all at once.
