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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
Why does a circuit stop working when you remove the battery?
The battery is the power source of the circuit. It supplies current to the circuit and the circuit is simply a path for the current to follow. When you remove the current (battery), the path still exists but there is no current going through it.
An inductor opposes a change in?
current flowing through it by inducing a voltage that creates a magnetic field, which stores energy. This property of inductors results in opposition to changes in current, which is described by Faraday's law of electromagnetic induction.
Resistors do not absorb energy in the sense that they store or convert energy. They dissipate electrical energy in the form of heat, which is a byproduct of resisting the flow of current through a circuit.
What is the power of a parallel circuit with a resistance of 1000 and a current of0.03 a?
I don't know what the parallel circuit has to do with it. You've only
given me a resistor and the current through it.
When 0.03A of current passes through a 1,000Ω resistor, the resistor
dissipates energy at the rate of 0.9 watt.
How does the voltage across a load is measured in a circuit with alternating current?
The voltage across a load in a circuit with alternating current is typically measured using a voltmeter. The voltmeter is connected in parallel to the load, allowing it to measure the effective voltage or RMS voltage across the load. This value represents the average voltage of the alternating current waveform.
The resistance of a conductor is determined by the length, cross-sectional area, and resistivityof the conductor. Since temperature affects resistivity, resistance is indirectly affected by temperature.
Resistance is directly-proportional to the length of the conductor and inversely-proportional to its cross-sectional area, and resistivity is its constant of proportionality. If the length of the conductor is expressed in metres, and the cross-sectional area is expressed in square metres, then resistivity is expressed in ohm metres. Using American units of measurements, however, where length is expressed in feet and cross-sectional area in circular mils, resistivity is normally expressed in 'ohm circular mill per foot' (not, as often seen in textbooks: 'ohms per circular mil foot'!).
In the case of d.c. current, the charge carriers distribute themselves across the entire cross-sectional area of the conductor. In the case of a.c. current, however, due to what is known as the 'skin effect', there is a tendency for the charge carriers to move closer to the surface of the conductor -this acts to reduce the effective cross-sectional area of the conductor and, thus, raise its resistance. So a conductor's resistance to a.c. is somewhat higher than it is to d.c., and is generally termed its 'a.c. resistance'. A.C. resistance increases with frequency (and should not be confused with 'reactance' or 'impedance').
If they're in parallel, then the resistors have no effect on each other.
The current through each one is the same as it would be if the others
were not there at all.
The current through the 120Ω resistor is 120 volts/120Ω = 1 Ampere.
The 60Ω and the 40Ω are red herring resistors.
Uses or function of vacuum tube in the circuit?
The simplest answer to that question is: Vacuum tubes were originally used to
perform every function now handled by transistors.
The transistor was a big improvement over the vacuum tube because in order
to perform those functions, a vacuum tube needs two power supplies, including
one at a comparitively high voltage, it occupies a comparitively ridiculous amount
of space, and radiates a comparitively ridiculous amount of heat.
When vacuum tubes were still the only way to go, there were no portable radios
smaller than a Chicago phone-book, and most of their weight was made up of
several heavy batteries.
Would a 2.5 a fuse blow if it were placed right next to the alarm clock?
It is possible for a 2.5A fuse to blow if it is next to an alarm clock, especially if there is a power surge or short circuit. Fuses are designed to protect the circuit from excess current flow, so any abnormal conditions could cause it to blow. It is important to ensure that the proper fuse rating is used and to investigate any potential electrical issues if fuses are frequently blowing.
What are the limitations of sequential circuits?
it can represent only the finite state machine.In such a machine an arbitrarily long sequence of input symbols is bound to create a periodic output with a period not more than the number of states.hence computations that need to remember an arbitrary number of past input symbols cant be implemented by seq machines
A superconductor performs best at?
A superconductor performs best at extremely low temperatures close to absolute zero, around -273 degrees Celsius. At this temperature, the material exhibits zero electrical resistance and can conduct electricity with maximum efficiency without any energy loss.
A superconductor performs best at what?
A superconductor performs best at very low temperatures, typically near absolute zero (-273.15°C or -459.67°F). This is when its electrical resistance drops to zero and it exhibits properties such as perfect conductivity and the expulsion of magnetic fields.
What two facctors determine the capacitive reactance of a capacitor?
The two factors that determine the capacitive reactance of a capacitor are the frequency of the AC voltage applied to the capacitor and the capacitance value of the capacitor. At higher frequencies and with larger capacitance values, the capacitive reactance decreases.
What particle moves when electricity flows through a circuit?
Electrons are the particles that move when electricity flows through a circuit. They carry a negative charge and flow from the negative terminal of the power source to the positive terminal.
What factors determine the voltage in a voltaic cell?
A voltaic cell has metal in it, so the types of metals can increase or decrease the voltage. The surface area of the metals in the acid (which must be used to generate electricity) can also increase or decrease the voltage. This is very basic, but I hope it helps.
What happens to amps when you increase the resistance of a circuit?
When you increase the resistance in a circuit, the current (amps) in the circuit will decrease. This is because Ohm's Law states that current is inversely proportional to resistance, so as resistance increases, current decreases.
What is the working principle of resistors?
A linear resistor is a linear, passive two-terminal electrical component that implements electrical resistance as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. Thus, the ratio of the voltage applied across a resistor's terminals to the intensity of current through the circuit is called resistance. This relation is represented by Ohm's law:
Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in most electronic equipment. Practical resistors can be made of various compounds and films, as well as resistance wire (wire made of a high-resistivity alloy, such as nickel-chrome). Resistors are also implemented within integrated circuits, particularly analog devices, and can also be integrated into hybrid and printed circuits.
The electrical functionality of a resistor is specified by its resistance: common commercial resistors are manufactured over a range of more than nine orders of magnitude. When specifying that resistance in an electronic design, the required precision of the resistance may require attention to the manufacturing tolerance of the chosen resistor, according to its specific application. The temperature coefficient of the resistance may also be of concern in some precision applications. Practical resistors are also specified as having a maximum power rating which must exceed the anticipated power dissipation of that resistor in a particular circuit: this is mainly of concern in power electronics applications. Resistors with higher power ratings are physically larger and may require heat sinks. In a high-voltage circuit, attention must sometimes be paid to the rated maximum working voltage of the resistor.
Practical resistors have a series inductance and a small parallel capacitance; these specifications can be important in high-frequency applications. In a low-noise amplifier or pre-amp, the noise characteristics of a resistor may be an issue. The unwanted inductance, excess noise, and temperature coefficient are mainly dependent on the technology used in manufacturing the resistor. Type your answer here...
How could you make a circuit switch out of a paper clip and 2 nails?
You can create a simple circuit switch out of a paper clip, two nails, and a battery. Use the paper clip as a bridge to connect the two nails and complete the circuit. When the paper clip touches both nails, the circuit is closed, allowing the electricity to flow.
What flux that does not follow the intended path in a magnetic circuit?
Leakage flux is the flux that does not follow the intended path in a magnetic circuit. It represents the magnetic field that strays outside of the core and does not contribute to the desired magnetic coupling between the components of the circuit. Strategies such as improving the design and materials of the magnetic circuit can help minimize leakage flux.
How is Mercury a superconductors?
mercury is not a superconductor.
However at a certain temperature is is known to have a super low resistance meaning that electricity could move much quicker ,making it a super conductor
The number of inputs in an OR gate can vary, but the most common type is a 2-input OR gate. This means that it takes two input signals and produces one output signal based on the logical OR operation.
If the batteries are placed in series then your current would be 1 amp, if the batteries were in parallel then 0.5 amps.
Voltage is common in parallel and additive in series.
1.5v + 1.5v = 3v (series) / 3 ohms = 1amp
1.5v (parallel) / 3 ohms = 0.5amps
Current = Voltage divided by Resistance
How much current and circuit that includes a 9- volt battery and a bulb with a resistance of 3 ohms?
A resistance of 3 ohms connected between the terminals of a 9-volt battery
will result in a current of 3 Amperes. If the battery is one of those little ones
with snaps on top, it may be able to produce 3 amperes of current for about
3 seconds before it rolls over and totally dies.
The heating effect of a wire is directly proportional to the square of the current passing through it. This relationship is described by Joule's Law, which states that the heat produced is equal to the current squared multiplied by the resistance of the wire and the time for which the current flows.
How do you recognize a series circuit?
There's only one route for current to flow through a series circuit.
Start at one terminal of the battery or power supply, and start tracing a path
through the circuit toward the other terminal, just as an electron must do.
If you EVER reach a point in the circuit where you have a choice of more than
one way to proceed, then that's a place where there are parallel branches, and
it's not exclusively a series circuit.
