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Electronics Engineering

Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.

24,372 Questions

How long does a 12 volt automotive charger set to slow charge take to charge a battery?

There are a few variables to take into account here. The discharged state of the battery and the current produced by the battery charger on the slow charge position are two of the most important. The amp/hour size of the battery is another governing factor.

Are anode rays emitted from anode?

There are no rays assign as anode rays (cathode rays are there in a discharge tube) but during discharge tube experiment positive rays are observed which are generated by decomposition of gaseous molecules present in the tube. X-rays are produced by striking of cathode rays with anode so x-rays may be called as anode rays.

What is the difference between a 1500 mAh and a 2800 mAh phone battery?

One lasts longer than the otherShort answer: a 2850 mAh will last quite a bit longer than an 1850 mAh.

Long answer: mAh stads for "Milliamp hours" Many flashlight bulbs use around 500 mAh, which means that in one hour, they will use up 500 milliamps of electricity. A standard double A battery ("AA") is 1.5 volts. Many flashlight bulbs require 2 batteries to operate... So lets make an example bulb. It's a 3 V 500 mAh bulb. With two 2850 mAh AA batteries, that bulb will shine roughly 11.4 hours before needing a charge (2850 mAh times 2 batteries is 5700 mAh total. Divide that by the bulbs' 500 mAh and you get 11.4 hours) With a couple of 1850 mAh, the same bulb would only shine for 7.4 hours. As a battery gets close to dying the bulb will dim. Picture the battery like your lungs. Take a full breath, the battery is charged. Breath out at a constant rate, and when you get close to the end of your lung capacity you will start to push less and less air until you are just *barely* blowing any air out. That's kindof what happens with a low battery (EE's will probably blast me on that one, but that's the best way to describe it to someone who doesn't feel like reading a term paper on electrons)

Hope that helps!

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Actually, if you put two 1.5V 2850mAh batteries in SERIES, you will get a 3V and 2850mAh battery. The voltage doubles but the current capacity does not. If you were to put the two batteries in PARALLEL, the voltage would remain 1.5V but the current capacity would double to 5700mAh. The consequence is that the bulb will shine half the time that was calculated in the original answer. The rest of the demonstration is fine.

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Some corrections the original answer:

Firstly a typical rechargeable AA cell is rated at 1.2v not 1.5v. Non-rechargeable AA cells are typically 1.5v.

Secondly mAh is a measure of the battery's capacity; bulbs do not have a capacity, so you do not rate a bulb in mAh you rate it in mA. So a conventional filament bulb as implied above might draw 500 mA from the cells when you apply 2.4 volts (in series).

Some correction are in order assume 500mah means that battery can provide 500ma for 1 hour that is true. That the way should be read.. At 1 hour do not expect nothing more. And adding two battery in parallel is a very bad idea there can be circulating current between batteries adding in series the current remain 500mah but the power has increase two fold because now there is 2.4v available.

Is ethane saturated?

As methane belongs to the group alkane compounds which do not contain C=C double bond therefore is saturated and not easily reacting with other molecules.

Current has only one loop to flow through in a?

A: All current in a loop must return to the source. A source may feed many loops but all these loops current will return to the source as a collective.

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Series Circuit

What is the load of a flashlight circuit?

The load of a flashlight circuit is the component that consumes electrical power, typically an LED bulb or an incandescent bulb. The load transforms electrical energy into light energy to illuminate the flashlight. It is an essential part of the circuit that determines the brightness and performance of the flashlight.

What watt resistor would you need in a 120 volt circuit with a 100 ohm resistor that has 2 amps load already?

If you connect a 100 ohm resistor across 120 volts it will draw 1.2 amps, amps = E/R. Power = volts x amps so the power required for the resistor would be 120 x 1.2 = 144 watts.

It would not matter if the 120 volt circuit already has 2 amps load on it by something else to calculate the wattage of the resistor.

The total power on this circuit would be the 144 watts from the resistor and 240 watts from the other 2 amp load (2a x 120v) for a total of 384 watts.

You are just asking that let us assume you have connected 2 or 3 resistors in a circuit and the current flowing through the circuit and from all the resistors will be same but how?

If the resistors are connected in series, the total resistance will be the sum of the resistances of each resistor, and the current flow will be the same thru all of them. if the resistors are connected in parallel, then the current thru each resistor would depend on the resistance of that resistor, the total resistance would be the inverse of the sum of the inverses of the resistance of each resistor. Total current would depend on the voltage and the total resistance

How does a Michelson interferometer convert phase modulation into amplitude modulation?

initially the two beams i.e. one reflected and one transmitted from semi reflecting glass were in different phase but when they superimpose two interference take place - constructive and destructive. since in both the interferences amplitude changes.

Why do you use 4 - 20 mili ampere?

A 4-20ma current loop is often used in process control and monitoring systems to signal a value from one point to another. It operates using Kirchoff's current law, in that the transmitter can monitor the current on the loop, knowing that will be the same current at the receiver. Any deviations in reference voltage or ground differentials between transmitter and receiver can then be compensated for at the transmitter. The signal range starts at 4ma, so that the receiver can detect the 0ma condition representing a break in the wire.

You can also have multiple receivers on the loop, all in series, so long as the delta voltage at each receiver does not contribute too much voltage to the overall loop. Each receiver will see the same current, again due to Kirchoff's current law.

What does a cathode ray consists of?

A cathode ray consists of a stream of electrons generated by heating a cathode. These electrons are accelerated and focused by electric and magnetic fields before hitting a phosphorescent screen to produce a visible image.

Rocks that originated from the liquid phase are classified as?

Igneous rocks are classified as rocks that originated from the liquid phase, specifically from the cooling and solidification of magma or lava.

What is the total current flowing through a 45 ohm resistor 1.4 amps and 20 ohm resistor 1.8 amps?

That depends on several factors that aren't specified in the question:

-- whether the resistors are connected to each other

-- whether they're connected in series or in parallel

-- the voltage applied across the ends of the circuit

While these two resistors are in their plastic packages hanging on the wall at Radio Shack,

the total current flowing through both of them is zero.

How were electrons produced from the cathode ray ube?

Electrons were produced in a cathode ray tube by applying a high voltage to the cathode, causing electrons to be emitted through thermionic emission. These electrons were then accelerated towards the anode by the electric field within the tube, creating a beam of electrons known as the cathode ray.

How does Atomic packing factor effect property of crystal?

The atomic packing factor (APF) influences the density, strength, and thermal properties of a crystal. A higher APF typically results in a denser crystal structure with stronger interatomic bonding, leading to higher density and increased mechanical strength. Additionally, a higher APF can also improve thermal conductivity due to the closer proximity of atoms in the crystal lattice.

Is converting ac to watts and dc to watts the same watts equals volts times amps?

Yes, watts is still volts times amps, for both ac and dc circuits. The complexity lies in the phase angle between voltage and current. If the circuit is purely resistive, the phase angle will be zero. If the circuit is capacitive or inductive, the the phase angle will vary, depending on frequency and on how much capacitive or inductive reactance there is. The difference comes into play when you consider true versus apparent power.

Short circuit bar on the railway?

A short circuit bar is a safety feature on railway systems that protects against electrical failures by providing a path for excess current to flow, preventing damage to equipment. It helps to ensure the safe and smooth operation of trains by rapidly detecting and disrupting any potentially hazardous electrical faults.

What are the best metal conductors?

Silver, copper, and gold are the best metal conductors, with silver being the most conductive. They are often used in electrical wiring and circuitry due to their high conductivity.

What about Isc short circuit current of solar cell?

Solar panels are rated very strange. Isc is current short circuit. The voltage is Eoc, or voltage open circuit.

The two are multiplied to get the power rating of the panel under max sun.

Problems here include:

1. Max sun is rare (2 to 5 hours a day is considered a normal "sun day")

2. You can not ever reach the current of short and voltage open condition.

A typical 100 watt panel may supply 76 watts at full sunlight. That means you will see 152 to 300 watts a day from a 100 watt panel. Hardly being honest.

What are voltage controlled voltage source?

when the magnitude of voltage of a source is controlled by another small voltage source in the circuit the former is called voltage controlled voltage source and the later is called controller voltage source.

Current in cars ac or DC?

The Current in a automobile is DC, you have a battery which is dc, and your alternator produces ac current but converts it to DC inside the alternator unit which gives your battery DC power. So basically everything in your car is DC.

What is 1.5amps 115 volts equal to in watts?

There really is no fixed answer. Amps are a measure of current, while watts are a measure of work. To get the answer, you need to know either how many volts you are dealing with, or how much resistance; the relationship is W= V*I (where I is the current in amps). That said, for a typical 120 volt household current, the number of watts would be 180.

Why does amperage stay the same in a circuit?

Amperes represents a flow of charge (coulombs) in a circuit in a period of time (seconds). In order to have that flow, you have to have conductance, which is the inverse of resistance. Since the conductance of two circuits not connected to each other is zero (infinite resistance, neglecting leakage) there can be no current flow between disjoint circuits. A node is a junction between two elements in a circuit, such as the connection between a resistor and a light bulb. If you consider that the only circuit between those two elements contains that node, and that leakage is inconsequential in comparision to the conductance of the circuit, then you have to note that the current entering the node must be the same as the current leaving the node. In fact, this is Kirchoff's Current Law: The sum of the currents entering a node must equal the sum of the currents leaving a node. (Usually, we think of current entering to be one sign (+) and current leaving to be the other sign (-), so the sum of all currents relative to the node is zero.) Expand this thinking little by little to encompass the elements in the circuit. Again, there is no path for current to flow other than through the elements of the circuit. This means that the current in every part of the circuit is the same. Keep in mind that this applies only to series circuits. In a parallel circuit, current can branch out between two elements connected to a node supplied by another element. In that case, the current in each branch will be different, depending on the resistance and voltage of that path. Circuit analysis is simply the consolidation of a complex circuit into a simple circuit by repeated application of various conversions, such as Norton and Thevanin equivalents, with the ultimate goal of knowing the voltage, current, and resistance for each element.

What does ohm sign symbolize?

The ohm is the unit of electrical resistance to current flow. More ohms (more resistance), the less current will flow. Less ohms (less resistance), the more current will flow. One ohm is defined as the amount of resistance that will cause one ampere of current to flow if the supply voltage is one volt. Ohm's law states that amps = volts / ohms So, if you had a 12 volt battery, and you connected a load, say a heating element that had a resistance of 3 ohms, how much current would flow in the circuit? amps = 12 volts / 3 ohms amps = 4