Electronics Engineering

C is a conductor, so valence and conduction bands overlap.

if you mean SiC, silicon carbide, energy gap is ~2.86eV @ 300K (ambient temperature)

No, the resonant frequency of a RLC series circuit is only dependant on L and C.

R will be the impedance of the circuit at resonance.

Either. although a passive device can only produce gain from 0-1 (-inf to 0dB)

an active device on the other hand is capable of producing gain thats greater than 1 (0dB)

A shunt-wound DC motor can maintain its speed well when the load torque varies.

when rectifier is on, the capacitor is almost transparent (it charges to the voltage provided from the rectifier)

when rectifier is off, capacitor holds the peak voltage since it stored a charge during rectifier on time.

maximum forward current in diode IN4007 is 30 amp

That'd be a relay.

frequency drops

This may vary by make and model of toaster and the intended operating voltage.

For a North American toaster designed to operate on a 15 ampere outlet at 120 volts RMS, the hot resistance cannot be any less than 8 ohms. By their nature, heating elements have a lower resistance when cold, so an 8 ohm element needs to be used on a circuit that is protected by a thermal time-delay circuit breaker; an ordinary fuse is likely to burn out during the several seconds it takes for the element to heat up and the current to reach the steady-state "hot" current. Due to the uncertainty of the circuit protection scheme, manufacturers will limit the current, and thus the power level of appliances such as toasters to something less than the maximum theoretical capacity of the circuit. For example, a toaster with an 8 ohm steady state hot resistance will draw 1800 watts. More realistically, the device will be designed to draw 1200 watts, and thus its hot resistance will be 12 ohms.

To put it simply, harmonics are unwanted, predictable, and repeatable noise riding on an electrical waveform.

In power applications, harmonics can damage equipment, overheat transformers, and cause erratic operation.

This is especially true if the harmonic is a multiple of the base frequency (100 Hertz, 150 Hertz, etc. for a 50Hz reference).

Total Harmonic Distortion (THD) is a term to describe the total waveform distortion by all the harmonics present on the waveform.

You should have as little as possible. Many power utilities require a THD limit at the point where a facilities connects to the utility.

the collector current is directly proportional to the base current

The barrier voltage of a diode is 0.7v for silicon and 0.3 for germanium. after this voltage is reached the current starts increasing rapidly... till this voltage is reached the current increases in very small steps...

Without knowing the circuit this cannot be determined. Sorry.

As resistance is defined as

R=pl/A

where p=resistivity of the medium

l=length of the medium

A=area

so all these regulates the amount of resistance

1 & 3

To tell you that we need to know the resistance of the entire circuit.

89M77 40+5MFD-440VAC dual run capacitor

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A 'centre tap' refers to a connection midway along the length of a transformer winding. In North America, the 240-V secondary winding of a distribution transformer is centre tapped, and grounded, thus providing the neutral. Each outer terminal of that winding is then at a potential of 120 V with respect to the centre tap. This enables US and Canadian residences to have both 240 V and 120 V supplies. 240 V is then used for high power appliances, such as ranges (cookers), while 120 V is used to supply lower-power appliances, such as kettles, toaster, etc.

100 megohm

the 10 ohms completely vanishes in the tolerance of the 100 megohm resistor, in that range tolerances can exceed 20% of nominal.

Joey doesnt share food

when the messege and carrier signals are going through a modulator it mixes the two waves ie, it's acts like a mixer and amplified it and send the signals through the air ie its acts like an transmittter. the carrier wave carring the messege signal