Electronics Engineering

is this an espresso maker for a car?

if so its a pretty large heating element and will need 12v at about 30A

it doesnt matter if its dc or ac to power the heater

the ac espresso makers are around 1000w and will make more faster

heating appliances need lots of power and dont care about ac or dc

its easier to get one in the correct voltage

Ohms law is: V = I x R (voltage = current x resistance) ... therefore the larger the resistance the larger the voltage drop across that resistance.

BUZZER IS SIMPLY A RELAY THAT MECHANICALLY OPENS AND CLOSES. A speaker is a coil suspended into a magnetic flux responding to AC signals

exlpain translates strategic plans into department action

What is this used for

This circuit generates a sweet melody for two minutes when it detects the shadow of a moving person. It uses the ROM IC UM66 to produce the melody. The music stops automatically.

LDR is used as the light sensor. In day light, its resistance is low and conducts. This keeps the base of T1 high and it remains off. When the shadow of the moving person falls on the LDR, its resistance increases and the current flowing through it decrease. T1 then conducts and C1 charges. This provides power to IC UM66. Zener diode ZD is used to regulate the supply voltage to UM66 to 3 volts. When UM 66 gets 3 volts supply, it oscillates and the music tone from it will be amplified by T2 which can be heard through the speaker

Control

It depends on the configuration of the ammeter. If you have an ammeter with red on one side, green on the other, and a balance point in the center, the needle will go into the red when when load is increased in relation to the charge. If the load is decreased in relation to the charge, the needle will go into the green.

If you have an ammeter with a numerical value (i.e. 30, 40, 50, etc.) then the needle will go up to the value of the load present in the system not in relation to the charge.

The current will of course vary with the intensity of the imparted light and with the temperature of the panel.

Everything in the series circuit will run dimmer / slower / cooler.

Since the available voltage is constant (13.6 volts from the battery), increasing the resistance
in the circuit causes the current through each device to decrease.

Depends. 802.11b has a longer range but less speed than 802.11g, however 802.11n(draft) has a longer range and higher bandwidth than both 802.11b and 802.11g.

It also depends on the antennae.

Also, is the signal going to go through a wall? I have spoken to many people who think that signal can go up the stairs, they're wrong. Signal, is radiated from the antennae, usually in all directions, BUT it always goes straight. If you've got bad signal, try moving the router and adjusting the antennae for optimum signal.

When stranded conductor is being used for earthing, It offers some reactance in addition to the resistance of the conductor. Since any kind of surge is of sudden in nature, and reactance opposes the change in flow of current (Property of Inductor), It might disturb the discharge rate of the surge. Hence the conductor is flat inorder to provide only the resistance

0.2 and 2.5

the frequency is 1 divided by the cycle time, or 1/100 microseconds = 10,000 cycles per second

A satellite that simply reflects light or radio waves transmitted from one ground station to another without any amplification or retransmission.

SERIES: A. If the additional battery is added to the circuit in a "Series Aiding" configuration, the bulb would get brighter. However, it would probably burn out very shortly, if not immediately, depending on the power rating of the bulb. Flashlight batteries such as two and three cell flashlights are usually series aiding. B. If the additional battery is added to the circuit in a "Series Opposing" configuration, the intensity of the bulb would decrease or go out completely if the opposing voltages are equal. (you can do a little experiment with a three or four cell flashlight by reversing the polarity of one or more of the batteries. The reversed battery will be series opposing and cancel 1.5 volts of the other batteries.) PARALLEL: If batteries are added to the circuit in parallel, the intensity of the bulb would remain the same but the batteries would last longer. Be sure the battery voltages are the same when adding batteries in parallel.

Microcontrollers are small in size. As such, they help in reducing the size of circuits. They are also easy to program hence presenting high levels of flexibility.

In many cases, yes, it is necessary to measure the conductivity of a material. We need to know how well materials conduct electricity, particularly if these materials are used in the construction of anything electrical or electronic. We need to know what we can use around electrical circuits that won't conduct well, and we need to find things to make up that circuit that are good conductors. Simple, easy to understand.

Ipomoea, like other plants, has to be harvested and dried. It can then be burnt in an ordinary power station to boil water. The steam turns a generator to produce electricity.

you cant :(

Passive Infra Red. Units that detect movement.

Yes.

The output voltage will not always be 240 volts - it will fluctuate. Plus a typical wind turbine throws out some harmonics due to the AC/DC/AC design necessary to convert it from speed of blade rotating to a constant 60 Hz.

If you are building this all yourself, for you own home use, and especially if you wish to disconnect from the grid, It might be best to build the turbine to AC/DC and charge a battery bank. A reverse charging protection schemed needs to be set up for when the DC voltage dips below the battery voltage (when the wind isn't blowing). A large home-sized DC-AC converter would be used to power the home off the battery bank, then. This scheme would protect the home from the harmonic output from the wind turbine (which could damage sensitive electronics like computers, LCDs, etc.).

Tape recording is a magnetic process; sound is translated into a pattern of magnetic fields which is recorded by a magnetic material (usually ferric oxide) that coats a plastic tape.

Reference the two definitions given below, one from IEEE and the other from US Army research document. Web links are found after each....

The use of cold FET measurements solves the problem

of junction heating and ANA protection. By 'cold', it is

meant that either Vgs = 0 or Vds = 0, and so a zero DC

drain current flows. Under these conditions, destructive

oscillations are prevented. Also, with the heat dissipation

equal to zero, the entire device merely has to be maintained

at the required measurement temperature. A disadvantage

of cold FET measurements is that the device is

measured under voltage and current conditions far

removed from those under which it will operate. Information

about the device is therefore lost. For example, some

nonlinear elements within a MOSFET show a current

dependence, which cannot be determined from cold

measurements.

The design of monolithic microwave integrated circuits (MMIC) is dependent on the ability to generate accurate device

models. Prior knowledge of the external parasitic components is required to determine the small-signal model of the intrinsic

device. In this report, we describe a technique and its implementation for extracting external device parasitics. The term cold

field-effect transistor (FET) refers to measurements taken when the drain is at the same voltage as the source.

A: Overload is a term used to describe a condition whereby a circuit is overstressed by additional loads imposed to it. Overload can be as small quantity or a very big quantity it depends on the circuit as it is stressed.