The Voltmeter is an electrical measuring instrument that measures Voltage (potential difference).
Voltmeters are placed in parallel with the section of the circuit to be measured.
Voltmeters can be analogue or digital and are based on the original Galvanometer instrument.
CAPACITIVE-RESISTIVE FILTER
⚜ What is a Capacitive-Resistive Filter? ⚜
A Capacitive-Resistive Filter is an electrical circuit made using capacitors and resistors and often used in rectifiers.
The Capacitive-Resistive Filter is used to pass only a certain range of frequencies of an AC signal voltage.
CRYSTAL OSCILLATOR
⚜ What is a Crystal Oscillator? ⚜
A Crystal Oscillator is an electronic oscillator that uses the piezoelectric effect of thin slices of quartz crystals to oscillate at a specific frequency.
Crystal Oscillators are used in computers as the base frequency of the microprocessor.
TRIVIA
🔔 QUESTION : What device from the 1980s used interchangable crystal oscillators to provide different channels?
💡 Hover or Tap for the ANSWER! 💡
The CB (Citizens Band) radio used interchangable crystal oscillators to provide different channels.
PHOTODIODE
⚜ What is a Photodiode? ⚜
The Photodiode is a semiconductor diode with reverse bias (no current flows).
When a Photodiode is illuminated, electron-hole pairs within the PN junction barrier are broken and an electric current flows.
AMPLIFIER
⚜ What is an Amplifier? ⚜
An Amplifier is an electric circuit using transistors or vacuum tube triodes to increase the voltage of an input signal.
Amplifiers are used in any electronic device that needs to amplify an input signal including radios and televisions.
VOLTAGE REGULATOR
⚜ What is a Voltage Regulator? ⚜
A Voltage Regulator is an electric circuit design to maintain a constant output voltage even if the load resistance or input voltage change.
VARACTOR
⚜ What is a Varactor? ⚜
The Varactor is a semiconductor diode with reverse bias (no current flows) with a capacitor.
The capacitance of the Varactor is controlled by the bias voltage. As the forward bias voltage increases, the capacitance increases.
VARISTER
⚜ What is a Varister? ⚜
A Varister is an electronic device with a voltage dependent resistance.
With Varisters, as the applied voltage increases, the resistance of the Varister decreases.
TRANSFORMER
⚜ What is a Transformer? ⚜
A Transformer is an electrical induction device with two windings of wire around a ferromagnetic medium.
The transformer is used to step-up or step-down an input voltage to provide a different output voltage.
Transformers are frequently used in power supplies.
AMMETER
⚜ What is an Ammeter? ⚜
The Ammeter is an electrical measuring instrument that measures electric current flowing through a circuit.
Ammeters are placed in series with the section of the circuit to be measured.
Ammeters can be analogue or digital and are based on the original Galvanometer instrument.
