Electronics Engineering

The circuit won't do anything until both terminals of the battery are connected

to the correct [two different] points in the circuit. As long as either terminal of

the battery remains disconnected, the circuit is "OFF".

Some devices have the receiver and transmitter built into the same device. Some devices use only a detector and register changes in emitted IR "patterns" (for example) to infer motion.

No single type of component does this, it is done by a circuit composed of many different components.

diodes are commonly used for rectification

the approximate efficiency of a class b linear RF AM amplifier is 35%

by varrying some paramers liike speed and voltage we ccan varry it

by varrying some paramers liike speed and voltage we ccan varry it

by varrying some paramers liike speed and voltage we ccan varry it

by varrying some paramers liike speed and voltage we ccan varry it

School's in. Ring the bell. First, let's jump around spotlighting the elements of the question so we understand them all. The rectenna (rectifying antenna) is a device that is really good at converting microwaves to DC. It's highly frequency sensitive and directionally sensitive. That means it only works on one frequency (or an extremely narrow range of frequencies) and rejects all others, and it's critical where the rectenna is pointed. The rectenna doesn't recycle, it converts. Antenna setups make the rectenna work even better. DC is, of course, direct current, like the uni-directional current flow from a battery. Microwaves are electromagnetic waves of really high frequency. Radio frequency (rf) waves are lower frequency than microwaves. Ambient rf (radio frequency) and microwaves are the rf and microwaves that we are bathed in every day. They're like the electromagnetic equivalent of air pollution. Sources are cell phone energies (both from the cell hub transmitters and the phones themselves), leakage from microwave ovens, the microwave energy beamed down from space, signals from radar, energy from imaging equipment,.... There's a lot of sources. And of extreme importance is that the pollution covers a wide range of frequencies. Modulated 0 Hz to 100 Hz waves are nowhere close to rf, let along microwave frequencies. They're like, bottom of the electromagnetic spectrum, and rf and microwaves are close to the top. Modulation can be simply described as the "adding of information to" a signal. Modulating a wave is adding information or intelligence to a carrier wave. We've covered everything in the question. Now to the answer. A rectenna system cannot keep a house clear of rf and or microwave pollution. The pollution comes in at many different frequencies, and the rectenna is highly frequency sensitive to a tiny range of microwave frequencies. And the pollution comes in through all the walls, doors and windows. A rectenna cannot even clear a house of all the signals on the frequency at which it is tuned (owing to scattering of the electromagnetic energy), even if it is pointed at the source. And no matter how big the antenna. A modestly useful analogy would be trying to completely darken the inside of an all-glass house on a bright day. Light is electromagnetic energy like microwaves and rf, but of even higher frequency. All-glass here because microwaves go through walls and roofs, and we need our analogy to work sorta like them. If we approached our "darkening" project by just using light absorbing materials all around the house in the different rooms, we'd be largely unsuccessful. It would be better to just coat all of the outside (including all windows) with a thick layer of paint. Everything. All of it. Because any window or even a large crack will let in light. Nothing inside a house will "keep a house clean of rf and microwave pollution" regardless of the cleverness of the inventor. Want to keep out microwave pollution? Cover your entire house top to bottom in a seamless sheet of aluminum foil. That'll work. As an aside, the 60 Hz AC energy on the power grid is hooked up to your house. Your house is bathed in fields generated by 60 cps AC. All day. Everyday. (And you doubtless grew up bathed in these fields.) The field strength of the 60 cps energy is probably as high if not higher than the field strength of ambient microwaves. This for dense urban areas. If you live in the suburbs or rural area, the 60 cps electromagnetic bath you are living in represents a far higher "dose" of electromagnetic energy than you'll be getting from cell phone transmitters. And it has done nothing to negatively affect your health. To now. Ignorance was bliss.

the fieldlines are pointing straight down. If your compass could rotate when held up (instead of lying flat on a table), the needle would point downwards.

Hmm, lets see; 1. closed 2. energized 3. a load(something drawing power, ie. light bulb)

A microwave turnstile junction is a waveguide for use at microwave frequencies that is used as a splitter to derive outputs with different symmetries. There is a pretty good drawing that can be viewed by using the link. Be sure to scroll down. The picture is on page 7 of the article. Consider the four rectangular ports are the "goes outas" and that should help lock it in. Precision in construction would be a must to get an even split, but that makes sense. Those microwaves are tricky. More ports are possible (a bigger turnstile) and a round input waveguide will help solve problems. The geometry (shape) of a microwave turnstile junction sets up a scattering matrix at the junction with a resulting differential symmetry (call it polarity) in the outputs. Keep it simple and it'll be easier to see how it works.

Three phase voltage can be measure line to line (L1-L2, L2-L3, or L1-L3) with a quality digital voltmeter. In the United States, typical 3 phase voltage is 208-230VAC, or 460-480VAC measured line to line. Line to ground or neutral with a 208-230V system will yield 110-120VAC, which provides standard household power for things like televisions and microwave ovens.

Yes. Depending on the design, the power supply can provide any voltage desired.

the best way is to compeair the data sheet of that transistor to the readings of that transistor. . . . .and u can get the readings of that transistor by using a fungction genrator and a c.r.o

frequency response curve helps us to find the bandwidth of particular amplifier circuit.

Bandwidth is the range of frequency at which the amplifier works better....

In case of 1phase

the reverse torque is obtained by reversing the current either in armature or field

when he connected the parts he got an electric current.

Four (4) 0.6 Henry inductors connected in series should add up to 2.4 Henry. An electrical event passing through one inductor in time "T" will require "4T" to pass through all four inductors. Hence, inductance adds up in a series of inductors connected end to end.

An electromagnet becomes stronger when the current through it increases, i.e. the Amps.

To design a bjt amplifier with gain 10, consider that gain in a class A common emitter configuration is collector resistance divided by emitter resistance.

So, pick the two resistors so that their ratio is ten. Bias the base so that the collector is at the center of the operating voltage range, along with the transistor being at the center of its linear region.

Of course, you need to consider impedance and operating current, so you need to choose carefully. Also, the beta (hFe) of the transistor must be substantially more than ten for this to work reliably.

Often, this voltage gain stage is followed by a class C common collector emitter follower to give you current gain as well.

the results are the same regardless of the gas

when diode is supplied with a voltage higher than RIV in reverse bias, the diode will burn out and will have zero resistance.

A: The terminology is new to me QUASI means not here or there The correct terminology is tri-state meaning it has 3 states as either hi or low or open see 74ls244,245 and so on for examples

A: Capacitance vary directly with the area applied the bigger the area the bigger the capacitor. There is another element that will increase the size that is the rating of the capacitor voltage since more material will have to be used to insulate the plates

A: THEVENIN theorem simply is a way to simplify a complex input and resistance to a simple form. maybe you are confusing it with nodal analysis