How do an induction cooker work?
An induction cooktop is simply an electromagnet you can cook with. Inside the glass cooktop, there’s an electronically controlled coil of metal. When you turn … Read more
Electrical Measurements and Measuring Instruments
Power measurement in a transmission line
In a transmission line, power is measured by means of a voltmeter between the conductors,and an ammeter in series with … Read more
Primary and secondary cells|Cells and Batteries
Primary and secondary cells primary cells Some … Read more
Cells and batteries|Electrochemical Cells
ONE OF THE MOST COMMON AND MOST VERSATILE SOURCES OF DC IS THE CELL. The term cell means … Read more
Bar-graph meters
A cheap, simple kind of meter can be made using a string of light-emitting diodes (LEDs) or a liquid-crystal display … Read more
Pen recorders
A meter movement can be equipped with a marking device, usually a pen, to keep a graphic record of the … Read more
Light meters or illumination meter|Lux meter
Light meters Light intensity is measured by means of a light meter or illumination meter. it’s easy to … Read more
VU and decibel meters
In high-fidelity equipment, especially the more sophisticated amplifiers (“amps”), loudness meters are sometimes used. These are calibrated in decibels, a … Read more
Frequency counters
The measurement of energy used by your home is an application to which digital metering is well suited. It’s easier … Read more
Watt-hour meters- principle and operation
The utility company is not too interested in how much power you’re using with one appliance,or even how much power … Read more
Wattmeter -principle and working
The measurement of electrical power requires that voltage and current both be measured simultaneously. Remember that power is the product … Read more
FET and vacuum-tube voltmeters
It was mentioned that a good voltmeter will disturb the circuit under test as little as possible,and this requires that … Read more
Multimeter- Principle and operation
In the electronics lab, a common piece of test equipment is the multimeter, in which different kinds of meters are … Read more
Ohmmeter- basic principle and working
You know that the current through a circuit depends on the resistance. This principle can be used to manufacture a … Read more
Voltmeter- Principle and operation
Current is a flow of charge carriers. Voltage, or electromotive force (EMF), or potential difference, is the “pressure”that makes a … Read more