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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
No. A short by definition is bypassing the load and returning back to the source without going through the load. Try breaking the circuit at the mid-point and see if the short remains. If it remains, the short is on the HALF closer to the source If it clears, the short is on the half further from the source. Continue "halfing" until you narrow it down. There is also special test equipment that will alow a user to trace along until the short is sensed.
How do you check with mega that you have good grounding on electrical circuit?
when you say "mega" I am asuming you mean meggar-ohmmeternot the lottery This instrument is not appropriate to test for good grounding Good grounding requires LOW resistance
A Meggar is used for measuring for HIGH resistances You need a MICRO-ohmmeter or ground resistance meter A company called AEMC makes nice ground testers
Why does the light socket smoke or pop when the switch is turned on?
It's not suppose to sizzle, you need a new light switch! It might start a fire!!
When a switch makes a noise when turned on, this would indicate a quite worn switch or a switch that is not connected properly.
The audible noise is made from electricity jumping over a small gap.
This jumping does unfortunately create heat and might in worst case cause a fire.
It might be easy enough as just tighten a few screws in order to correct this.
Under what condition will the power factor of a series R-L circuit approach unity?
When the Inductor's value equals Zero, then the Power Factor reaches 1.
Conversly, when the Resistance equals 0, the Power Factor becomes Zero.
The Power Factor for a Series R-L Circuit is equal to R / sqrt (R^2 + (w*L)^2 )
Explain how a circuit can perform a specific function?
Electrical circuits are used to perform a vast and variegated panoramic
cavalcade of different functions. They include but are not limited to . . .
- create, control, and detect light
- create, control, and detect sound
- create, control, and detect heat
- create and control alternating currents
- add information to electric current
- transmit the information over vast distances
- capture information-bearing signals and recover the information
- detect and measure speed and acceleration
- measure distance
- separate chemical compounds into their elements
Specify the function and we'll provide a rudimentary explanation of
how it's performed electrically.
How do you separate iron fillings and sand?
magnetic separation-the iron fillings are small and can be magnetize so, by using magnets you can able to separate sand from iron fillings
Drift is the effect of temperature on an operational amplifier (op-amp). Ideally you want zero drift (ie. op-amp is not affected by change in temperature), however this can never be practically achieved.
Voltage was named after the Italian physicist, Count Alessandro Volta, who invented the electric battery in the late 18th century.
Formula for spherical capacitor?
The capacitance of a spherical capacitor can be calculated using the formula C = 4πε₀r₁r₂ / (r₂ - r₁), where ε₀ is the permittivity of free space, r₁ is the radius of the inner sphere, and r₂ is the radius of the outer sphere.
What two factors determine the capacitive reactance of a capacitor?
The two factors that determine the capacitive reactance of a capacitor are the frequency of the alternating current passing through the capacitor and the capacitance value of the capacitor. Capacitive reactance (Xc) is inversely proportional to the frequency (f) and directly proportional to the capacitance (C), as calculated using the formula Xc = 1 / (2πfC).
Is there a polarity in an alternating current circuits?
Yes, there is a polarity in an alternating current (AC) circuit, but it constantly changes direction. In an AC circuit, the current flow reverses direction periodically, typically 50 or 60 times per second depending on the frequency of the power source. This changing polarity allows the current to flow back and forth, enabling the transmission of electrical energy over long distances efficiently.
Distinguish field theory and circuit theory?
circuit theory:
1.this analysis is oriented by its own.
2.applicable only for portion of RF range.
3.the dependent and independent parameters,I and V are directly obtained for the given circuit.
4.parameters of medium are not involved.
5.laplace transform is employed.
field theory:
1.envolved from transmission theory.
2.beyond RF range.
3.not directly through E and H.
4.parameter of medium are involved in the analysis.
5.maxwell equqtion is employed.
What kind of circuit allows a current to flow through it?
A closed circuit allows a current to flow through it, which means there is a complete path for the electrons to travel from the source, through the load, and back to the source. This circuit can consist of various components like wires, resistors, capacitors, and more, connected in a loop to enable the flow of current.
What might happen to the bulb if you added too many extra batteries to the circuit?
If you added the batteries in parallel, then the bulb would stay on for a long time
and nobody would get any sleep. If you added the batteries in series, then the
voltage across the bulb would eventually become excessive and the bulb would
burn out.
What happens when you unscrew a light bulb in a circuit with two bulbs?
There are a few possible different results. One thing that happens in EVERY
possible situation is that the bulb you unscrew is dark after you unscrew it.
-- If the two bulbs are configured in either a series or a parallel arrangement
and the power is off, then both bulbs are dark before you unscrew one, and
nothing changes after.
-- If the power is on and the two bulbs are configured in parallel, then the one
you don't unscrew continues to glow after the other one is gone.
-- If the power is on and the two bulbs are configured in series, then BOTH bulbs
go out when you unscrew only one of them.
What must be disconnected from a circuit under test before connecting the ohm meter to the circuit?
The power source must be disconnected from the circuit under test before connecting an ohm meter to prevent potential damage to the meter or the circuit. This ensures that there are no active voltages present while taking resistance measurements.
What happens when you unscrew a light bulb in a series circuit?
When you unscrew a light bulb in a series circuit, the circuit will break and all the other light bulbs in the circuit will turn off. This is because in a series circuit, the current flows through each component in succession, so removing one component interrupts the flow of current to the rest of the circuit.
What is electric current flow?
its lightning, for a more simple answer......
electric current flow is the movement of charges. Most often, however, we consider electric current flow to be moving electrons, or electron current flow.
We most often use the term electric current flow to refer to the moving electrons, the flow of which is measured in amperes.
Earlier scientists, before the discovery of electron, do believe that current flows right from positive terminal to the negative. This is known as conventional current flow.
So electron flow is always opposite the direction of conventional current.
What is th potential difference that causes charges to move in a circuit?
The answer is voltage, resistance, electric discharge, and current. It is caused by a difference in energy stability between two points that favors a charge to move down a potential difference.
What is density of transformer?
The density of a transformer depends on the materials used in its construction, such as the core, coil, and insulation. Typically, transformer density ranges from 1.6 g/cm3 to 2.2 g/cm3. Transformers with higher power ratings tend to have higher density due to the larger amount of material needed.
Describe the purpose of the coloured bands on a resistor?
The colored bands on a resistor indicate its resistance value and tolerance. By interpreting the color code, you can determine the resistance value of the resistor and the range within which the actual resistance may vary. This helps in identifying, sorting, and using resistors in electronic circuits.
Use the equation, V= IR from Ohm's Law V is the voltage, I is the current, and R is the resistance in ohms So then, solve the equation for I (the current) and you get I=V/R. Then just plug in the values... I= 12/3, which equals 4 A. (For current, it is measured in amperes, or just "A" as the unit.)
If a wire on a series circuit is disconnected what will happen to the two lights?
If a wire on a series circuit is disconnected, both lights will go out. In a series circuit, current flows through each component in sequence, so if the circuit is broken by disconnecting a wire, the current cannot flow through either light.
Why are there couler bands on a resistor?
Color bands are used on resistors to indicate their resistance value and tolerance. Each color represents a digit, and by combining multiple colors, you can determine the resistance value. The bands help quickly identify the resistor's value without needing to use a multimeter or other measuring tools.
