Ø
Maxwell’s loop current
method of solving electrical networks utilizes Kirchhoff’s voltage law.
Ø
Megger is a portable
instrument used for testing the insulation resistance of a circuit in terms of
Mega ohms.
Ø
One farad is the
capacitance of a capacitor which requires a charge of one coulomb to establish
a potential difference of one volt between its plates.
Ø
One kWh of energy equals
nearly 860 kcal.
Ø
Permanent magnets are
normally made up of alnico alloys.
Ø
Relative permeability of
vacuum is 1.
Ø
Secondary instruments
are those, in which the value of electrical quantity to be measured can be
determined from the deflection of the instruments, only when they have been
pre-calibrated by comparison with an absolute instrument.
Ø
Sources for Generation of
Electricity using Conventional methods are Thermal and Hydro-Electric.
Ø
Sources for Generation
of Electricity using Non-Conventional methods are wind power, photo-voltaic
cells and Fuel cells.
Ø
Statically induced e.m.f
is further sub-divided into mutually induced e.m.f. and self-induced e.m.f.
Ø
The algebraic sign of an
IR drop is primarily dependent upon the direction of current flow.
Ø
The capacitance of a
capacitor is not influenced by plate thickness.
Ø
The capacity of a cell
is measured in ampere-hours.
Ø
The damping force in an
instruments can be produced by air frictions, eddy currents and fluid friction.
Ø
The direction of the
induced current is decided by applying either Fleming’s Right-hand Rule /
Flat-hand rule / Lenz’s Law.
Ø
The electric energy
required to raise the temperature of a given amount of water is 1000 kWh. If
heat losses are 25%, the total heating energy required is 1333 kWh.
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