Electronics Engineering

yes, of course.

In a radio receiver, a gang condenser is a type of air capacitor

Yes, one mega ohm is more than one kilo ohm. Mega means million, kilo means thousand.

design and implementation of a buffer circuit using operational amplifier

The basic difference between fdm and fdma is that fdm is used in wired system where as fdma is used in wireless communication.

a memristor is the fourth passive element in the electric circuit joining the resistor,inductor and capacitor , the word memristor is the concatenation of "memory" and "resistance"

imitation of ohms law is that it can be applied only to linear devices it cannot be allowed to non linear devices...

Hold mode button til it says cal. Press mode again, 100 will show on the scale. Put 100 grams (20 nickels) on and it should say pass.

Introduces the aliasing effect which eventually would account for information loss...(aliased signals)

In Double Sideband AM (DSB-AM) modulation, two thirds of the power is consumed by the carrier, so 667W would be transmitted at the carrier frequency. The remaining 333W is split equally between the two sidebands, each being mirror images of each other.

Hysteresis

Downward multiplexing refers to distributing a single signal across multiple channels.

The C represents the capacitance (in farads) of the capacitor. It is a measure of how much charge a capacitor can hold. This is needed to know how much energy the capacitor is holding.

Power = V*I

Power = (V) * (C*dV/dt)

To store more / less power / charge, charge the capacitor with a greater / smaller voltage (make sure the cap is rated for at least as much as the voltage you are charging from, though).

inductance

modulation means transmitting the signal which is to be transmitted along with the carrier wave, then at the receiver it is separated from the carrier and demodulated. So modulation is needed so as to transmit the signal over long distances with higher accuracy. Hence it is required before multiplexing.

A surge capacitor is used to mitigate (minimize) voltage surges. Capacitor impedance can be modeled as 1/jwC, j = i = imaginary value used in vectors, w is the frequency, and C is the capacitance. A fairly small capacitor on the input to a power supplying circuit will have a large impedance, and so will impact the circuit operation very little due to the low power frequency. Surges are high frequency. When a surge occurs, the capacitor impedance appears much smaller to the high frequency surge, effectively shunting the surge energy to ground; this minimizes the surge with respect to the protected circuitry.

1.25k

Following Ohms Law
Equation:
R = E / I
(R=Resistance, E=Voltage, I=Current)

Known Values:
E = 5v
I = 1mA = 0.001A

R = 5/0.001
R=5000
Total Resistance is 5000ohms, since we know there are four equal resistors simply divide by 4
R/4=5000/4

R=1250ohm=1.25kohm

The physical appearance varies depending on the type of capacitor in question. The main similarity between the different types is that they have two leads.

Electrolytic Aluminum Capacitors come as metal cans in appearance, and can be radial (both leads at the bottom) or axial (one lead at the top, one lead at the bottom). This type of capacitor is also polarized and typically will have a symbol indicating which lead should be connected to ground (most common) or a symbol for the lead that connects to the voltage source. Typically there will be a capacitance rating in Farads on the capacitor.

Ceramic Capacitors come in many different appearances, one commonly found is a disc shape. These capacitors are not polarity sensitive and thus have no markings indicating polarity. They are smaller than Electrolytic Capacitors and usually do not have enough space to display a Farad rating but will use a numeric code (similar to color bands on resistors)

There are many other types of capacitors and also "homebrew" capacitors composed of soda bottles and tin foil, which makes giving an exact answer to "What does a capacitor look like?" difficult.

1. The amount of current flowing through the coil

2. The number of coil turns around the core

3. The rate at which the conductor moves through the magnetic field

4. The amount of reluctance that exists inside the magnetic field

A Resistor

An ideal diode would match the purpose of a diode without any of the drawbacks. The purpose of a diode is to control current flow - The diode "turns on" for current flowing in one direction, and "turns off" if current wants to flow in the other direction. Ideally, there would be no voltage drop across this diode when allowing current flow, thus no power loss. When the diode is "turned off" by a negative voltage, idealy there would be no current flow (no matter how large the negative voltage).

Output from secondary is about 6.8V rms, on no load.

On the primary side, you have 140 / 120 = .86 volts per turn. Therefore, on the secondary side you will have 8*.86 = 6.8 volts.

Hum is caused in (low frequency) AC capacitors by electrostatic forces between the capacitor's plates, causing them to vibrate.