0
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
Can a circuit have two bulbs and a buzzer?
Of course. The circuit in my house has two door buzzers and almost 30 bulbs.
Does it matter which way a emitter resistor is installed?
A resistor is not polarity sensitive, and may be installed in either direction.
That's why resistors don't have pluses ( + ) or minuses ( - ) printed on them.
"Ohm" and its multiples is not a unit of current.
"Ampere" and its multiples is.
The current through a 2.2-megohm resistance is
(the voltage across the resistance)/(2,200,000) amperes .
Were does Rt R1 R2 comes from?
Rt = R1 + R2 That's the formula for the total effective resistance
of two resistors in series.
In the context of programming, a probe method is a function or routine used to test or gather information about a specific aspect of a system or component. It is commonly used for debugging, performance monitoring, or system analysis purposes. The probe method typically returns data or metrics that help in understanding the behavior and state of the system.
When installing and Isolated circuit, the orange-insulated conductor is required to be connected to the nickel-plated screw of recepticals
850 C of charge in 2 minutes means 850 C in 120 seconds = 71/12 C per second.
"1 C of charge per second" is the definition of 1 Ampere of current.
You don't need to know about the bread, and I don't know what the GRASS method is.
What is the significance of obtaining a negative reading in testing voltage?
Electric current can flow in one of two directions in a wire; with alternating current, the direction changes continually, back and forth. The use of positive and negative values for voltage gives you a direction for the voltage. If current flowing to the right is positive, then current flowing to the left is negative.
============================
Answer #2:
A negative reading indicates that the point to which the positive probe of
the voltmeter is connected is at a lower potential than the point to which
the negative meter probe is connected. It tells nothing about the circuit
conditions except in combination with the knowledge of how the meter
is connected.
There's no single answer that covers all possible machines. It may run faster than
normal. It may run hotter than normal. It may run fine but with a shorter lifetime.
It may run fine but all the downstream devices that depend on it drop like flies.
The results are different for different machines.
How does voltage change across an appliance in a parallel circuit?
With the minor voltage loss in the wiring, the voltage drop across a single appliance
is the total voltage in the circuit, and doesn't change when more devices are added
in parallel.
What is the current sourcing capacity of 7805 IC voltage regulator?
The manufacturers refer generically to this device as a "One-ampere" voltage regulator.
It can be designed for more, if the junction temperature can be kept down with
adequate heat-sinking, and some hot-shot home-brewers will run it up to 2.2 Amp.,
especially on peaks and in low-duty-cycle operation. But the official data-sheet-
recommended limit is 1 Amp.
Is joules heating always desirable?
Joule heating is referred to as ohmic heating or resistive heating because of its relationship to Ohm's Law. It forms the basis for the myriad of practical applications involving electric heating. However, in applications where heating is an unwanted by-product of current use (e.g., load losses in electrical Transformers) the diversion of energy is often referred to as resistive loss. The use of high voltages in electric power transmission systems is specifically designed to reduce such losses in cabling by operating with commensurately lower currents. The ring circuits, or ring mains, used in UK homes are another example, where power is delivered to outlets at lower currents, thus reducing Joule heating in the wires. Joule heating does not occur in superconducting materials, as these materials have zero electrical resistance in the superconducting state. so it is sometimes desirable and sometimes not............
What resistance is needed to reduce 5V dc to 4V dc?
The resistance needed is
1/(the current flowing through the resistance) ohms.
What is the circuit diagram on how to convert galvanomeer into ohmeter?
Just connect a resistor and a small battery in series with the galvanometer,
change the markings on the meter's scale, and you have an ohmmeter.
What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?
I'm assuming that by ' IT ' you mean ' It ' for 'total current'.
-- The effective resistance of 2k and 1k in parallel is 2/3 k ohms.
-- The power dissipation is I2R = 0.003 x 2/3 k = 2 watts
What is the best suitable component for circuit protection instead of fuse?
circuit breaker, or "resettable fuse", which is a really
a small circuit breaker in the housing of a fuse
What is the mathematical relationship between heat dissipation and applied voltage?
Heat dissipation is directly proportional to the square of the applied voltage according to Joule's Law. This means that as the voltage increases, the heat dissipated in a circuit also increases quadratically. The relationship is represented by the formula: Heat dissipation = V^2/R, where V is the voltage and R is the resistance in the circuit.
What is a material that allows electron to flow easily or with little resistance?
Those are the materials we loosely call "conductors".
How many joules are in 746 watt-seconds?
1 watt-second = 1 joule
.
.
.
746 watt-seconds = 746 joules
(746 watts is an interesting number, and I'm curious to know how it was
selected to be the number in the question. 746 watts = 1 horsepower.
1 horsepower = 746 joules of energy per second.
The number is easy to remember: The mainsail on the Santa Maria developed
2 HP in a fresh breeze during Christopher Columbus' first voyage in 1492.)
What the three type of opposition to current flow impedance represants?
I think it's only two types. Resistance, the real part of impedance, and reactance,
the imaginary part. All possible values of impedance can be made from suitable amounts
of each of these.
If you absolutely must have three types, then you'll be relieved to hear that reactance
can be positive (inductive, voltage leading) or negative (capacitive, voltage lagging).
What is meant by negative gradient of a quantity?
The gradient of a quantity is the greatest rate at which it changes as you move in
different directions from where you are now. If the quantity has a negative gradient,
that means that the quantity decreases in that direction.
A great example of a negative gradient is the elevation of the land at a point on a
road that has a hill on one side and a cliff on the other side.
The greatest rate at which the elevation changes is in the direction off the edge of
the cliff, and it's negative in that direction.
How much current goes through a blender?
There are a number of ways to calculate that current, from which you're
free to select the most convenient one. Here are a couple of them:
Current = (the mains voltage)/(resistance of the appliance)
Current = square root of (power consumed by the appliance/resistance of the appliance)
What constitutes a complete electrical circuit?
A complete electrical circuit occurs when it is possible for electrical current to flow
through the electrical devices in it.
