BEEE

electricity

The invisible energy that constitutes the flow of electrons in a closed circuit to do work is called

frictional electricity

is the least important of all methods for the production of electricity. It can be produced by rubbing certain dissimilar materials together

piezoelectricity

Electricity produced from pressure is called

photoelectric effect

The electricity is produced by light striking photosensitive materials. These materials release electrons when excited by light under the right conditions. These releases of electrons are called

electrical conductor

is a material that allows electric charge to flow through it with little resistance.

insulator

They are made of materials, generally non- metals, that have very few or no “free electrons” float about within their basic atom structure

direct current

is an electric current that is uni-directional, so the flow of charge is always in the same direction. 

electric circuit theory

▪Fundamental theory upon which all branches of electrical engineering are built.

electric circuit

is an interconnection of electrical elements and each component of the circuit is known as an element

closed circuit

When load works on its own in a circuit then it is called

open circuit

When there is a faulty electrical wire or electronic component in a circuit or the switch is OFF, then it is called

short circuit

When both points of voltage source in a circuit gets joint with each other for some reason then it is called

ammeter

is an instrument used to measure current and must be connected in series with the circuit.

voltmeter

is an instrument used for measuring electric potential difference between two points in an electric circuit and must be connected in parallel with the part of the circuit whose potential difference is required

wattmeter

is an instrument for the measurement of power in an electrical circuit.

ohmmeter

is an instrument for measuring resistance.

multimeter

or universal instrument, may be used to

measure voltage, current and resistance.

charge

is an electrical property of the atomic particles of which matter consists, measured in Coulombs (C).

alternating current

The flow of electric charge in a periodically reverse direction is known as

voltage

(also known as electric potential difference, electromotive force emf, electric pressure, or electric tension) is defined as the electric potential difference per unit charge between two points in an electric field.

power

is the time rate of expending or absorbing energy, measured in watts (W) or J/s,

Ohm’s law

It states that the current flowing in an electric circuit is directly proportional to the impressed emf applied to the circuit and inversely to the equivalent resistance of the said circuit.

potential divider

is the simplest way of producing a source of lower e.m.f. from a source of higher e.m.f., and is the basic operating mechanism of the potentiometer, a measuring device for accurately measuring potential differences.