Electronics Engineering

If a DC supply is connected to the incomer of a transformer, you effectively have a short circuit, because the DC impedance of a transformer (actually, any inductor) is quite low. You will blow something.

When connected in series, the overall effective resistance of a bunch of individual resistors is

the sum of the individual resistances. It's always more than the resistance of any individual.

When connected in parallel, the reciprocal of the overall resistance of a bunch of individual resistors

is the sum of the reciprocals of the individual resistances. It's always less than the resistance of any

individual.

When two resistors are connected in parallel, the overall effective resistance of the pair is

(the product of the two individual resistances) divided by (the sum of the two individual resistances).

It's always less than the smaller individual resistance.

3

Rough estimate is that one btu is enough energy to change the temperature of one pint of water, one degree over a period of one hour.

0.4 seconds, ventricular contraction is 0.3. It goes 1.A 2.D 3.B 4.C

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Scroll down to related links and look at "Interconnection of two units" and find the impedance picture of amplifier and loudspeaker or microphone and amplifier. Learn about "voltage bridging" - Zout < Zin.

The stator and rotor of a machine are not made from sold pieces of metal. They are constructed by clamping stacks of thin sheets of silicon steel, called 'laminations', together. Laminations are essential to minimise circulating currents due to voltages induced into the core/rotor when the machine is operating. These laminations are created by a stamping machine, which cuts the required shape from large sheets of thin metal.

electrical resistance, named after German physicist Georg Simon Ohm

There is internal resistance in a battery because a battery is not an ideal voltage source. It may be close, but it is not ideal. As a result, analytically, there will be some series resistance, resistance which places a limit on the maximum current that the battery can provide.

While no battery is ideal, most are sufficiently ideal to not require any consideration of the internal resistance. If your circuit is dependent on the internal resistance of a battery, then it is probably not well suited for that application.

The 3140 was created as a direct replacement for the 741, not really the other way around. That being said...

Most of the time, I'd say yes. However the 3140 has a higher input impedance than the 741, so there is the chance you could drag down whatever is driving the inputs.

Circuit board kits vary in cost depending on what type of circuit board you are building. You can buy circuit board kits from Amazon starting at $35.00. There are many other options out there as well.

The armature has the stationary (not physically moving) magnetic field, which attracts the magnetic field in the rotor. Since DC does not alternate, a split ring is used to alternate the current (and resulting magnetic field), so that the rotor will spin.

Aim of any measuring instrument is to measure the object without affecting it. Voltmeter is used to measure voltage between two points and connected in parallel. Thus voltmeter should not change the voltage. If voltmeter resistance is very high, it will be as good as infinity compared to load. Thus connecting voltmeter will not change the voltage and measure it accurately.

doping concentration,temperature are the major source of reverse current

due to the extension of loads they are using the relays for protection.........

Linear systems are easier to understand and help you build an understanding of the workings of a system. Once you have a firm understanding of linear systems and the mathematics are understood you will be in a better position to understand more complex non-linear systems.

Analog computing mechanisms can reach a solution much faster than digital computing mechanisms can for the same problem; but to get more digits of accuracy, analog computing mechanisms require expensive high-precision, low-drift, temperature-stable components, while digital computing mechanisms can be expanded inexpensively to as many digits as desired.

cathode rays can emit electrons anode can collect them

The two ways to charge a neutral body with static electricity is to dump a bunch of electrons onto it, thus making it negative, or attracting a bunch of electrons off of it, which will make it positive. There are several mechanisms that will allow us to do this. Just one example is to rub a balloon on your hair (if your hair is relatively dry) and you'll separate charges. This will cause the balloon to stick to your hair via the mechanism of static electricity.

One does NOT insert a voltmeter in a series cirtcuit...an ammeter can be inserted in series, though. A voltmeter is connected in parallel with the source voltage and low(ground) side.

Air is not a conductor of electricity if it conducts electricity we cannot live. And if there is any ions present then only that can conducts electricity but air is a mixture of gases. So it is not a conductor. Lightning is proof that air is a conductor, however it is not a 'good' conductor it is about average. Air conductivity changes with moisture (humidity)and temperature level. The higher the moisture in the air, the higher its conductivity. Yes it is the water in the air that conducts generally, but the question was not "is oxygen / nitrogen / methane / etc" a good conductor. Our "Air" or "Atmosphere" is made up of a great number of components.

"Paschen's Law" is what covers this question, and is pretty complex being "V=(a(pd))/(ln(pc)+b) - see link below).