Physics

A transformer consists of two electrically isolated coils and operates on Faraday’s principal of “mutual induction”, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.

High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).

The mole, symbol mol, is the SI unit of amount of substance of a specified elementary entity, which may be an atom, molecule, ion, electron, any other particle or a specified group of such particles; its magnitude is set by fixing the numerical value of the Avogadro constant to be exactly 6.022 141 29 × 10 when it is expressed in the SI unit mol.

Ultra violet radiations of the Sun do not reach the earth because, earth’s atmosphere is surrounded by Ozone.

The ratio of the velocity of light in a vacuum to its velocity in a specified medium.

The electric current in one part of a circuit is measured with an ammeter, which gives a reading in ampere.

A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms).

The pressure exerted by a 760 mm column of mercury at 0 °C is known as “Pascal”.

Microscopes that are used to view metal surfaces are scanning tunneling microscopes.