Electronics Engineering

It gives frequency modulated signal

Most humans are incapable of hearing frequencies slower than about 20 Hz.

An uninterruptable power supply is a power device for a computer (or other things) which is designed never to lose power in the middle of crucial operations. For example, if you're running a computer which is in charge of a critical process and there is a disruption in the power coming into the computer, the uninterruptable PSU (power supply unit) is designed to make sure the computer doesn't stop the process it was working on and lose data.

It is normal to ground the centre tap of a centre-tapped winding so that the live voltage on either end of the winding is minimised relative to earth.

In North America the 240 v secondary of a supply transformer has a grounded centre tap so that a property can be supplied with two separate 120 v circuits for lighting and other low-power use, while a 240 v supply can be taken from the two live wires for high-power use for cookers, aircon etc.

In Europe split-phase supplies are used in rural areas where a 460 v transformer-secondary is centre tapped and a 3-wire supply sent to a remote site with a neutral wire and two 230 v live wires. Alternate properties are connected to alternate live wires and if they all use the same current there is no current in the neutral wire going back to the transformer, and therefore no power is lost in the neutral wire.

when you think of electricity and resistance think of it as water in a river and rocks in a river. The water being the electricity and the rocks being the resistance. when water in a river flows and then come across rocks that block the water from flowing constantly, it slows down the water. therefore when electricity is flowing through a circuit with resistance, when it hits the resistors it slows the flow of electricity.

Its resonant frequency is where its length is half a wavelength, so for 100 MHz the wavelength is 3 metres and a 1.5-metre long dipole is resonant. A dipole antenna can be used for many applications within a band of 10-20% around the resonant frequency.

because it delays the input signal by some time interval before it appears on the output.

You will need to add an anode and cathode, such as a penny and a nickel. Then add a load resister and use an amp meter to measure current flow, which will change depending on resistance. Measuring the potential current would prove more difficult.

2,250Ω

About 180 watts assuming a 90% conversion efficiency.

Without some idea of the circuit surrounding R3, no answer can be given.

AND gate is A.B

If two not gates are added at both inputs of and gate then output becomes A'.B' which is equal to (A+B)' by DeMorgan's law.

hence the nor gate is formed

Update: Put more simply, invert A and B by attaching A to both inputs of one NOR and attaching B to both inputs of another NOR, then NOR the results of the previous two NOR gates. Total of three NOR gates in a two-level implementation.

NAND can obviously be created by inverting the result.

The carrier signal occurs at the beginning to transmit information.

It will oscillate if the loop gain exceeds 1 when the phase difference round the loop is 360 degrees. The frequency of oscillation is set by the loop phase being equal to 360 degrees.

Yes, Pyranol is a nasty substance.

With a common emitter amplifier it's the emitter that is usually grounded.

I = E ÷ R = 120V ÷ (60Ω + 40Ω + 20Ω) = you figure it out now

Some devices are internally either in the open drain or in the open collector configuration.

So in order to create a closed path for the current the device is pulled up with a resistor to the supply.

It is a bias of a fixed voltage supplied by a separate low-power bias supply. Early radios used a 9 v tapped bias battery. In some amplifiers fixed bias can be dispensed with and the bias voltage is derived from one of the currents in the circuit.

Divide 1 million by 200,000 and the answer is 5 seconds.

when a light is on it is part of a scolde circuit

a socket that is soldered to a printed circuit board, into which a 8 pin integrated circuit package may be plugged to connect it to the circuitry.

A heat-sink is needed to dissipate the wasted power without any undue temperature rise. The effectiveness of a heat sink is measured by the watts dissipated per degree of temperature rise.

a form of low voltage DC to high voltage AC power conversion circuit.