Magnetic fields can be set up not only by permanent magnets, but also by electric currents. Let a piece of wire be arranged to pass vertically through a horizontal sheet of cardboard on which is placed some iron filings, as shown...
Category - Electrical
(a) Capacitors connected in parallel Figure shows three capacitors, C1, C2 and C3, connected in parallel with a supply voltage V applied across the arrangement. When the charging current I reaches point A it divides, some...
Alternative energy refers to energy sources which could replace coal, traditional gas and oil, all of which increase the atmospheric carbon when burned as fuel. Renewable energy implies that it is derived from a source which is...
The electromotive force (e.m.f.), E, of a cell is the p.d. between its terminals when it is not connected to a load (i.e. the cell is on ‘no load’). The e.m.f. of a cell is measured by using a high resistance voltmeter...
A material must contain charged particles to be able to conduct electric current. In solids, the current is carried by electrons. Copper, lead, aluminium, iron and carbon are some examples of solid conductors. In liquids and...
(a) Colour code for fixed resistors The colour code for fixed resistors is given in table. Colour Significant...
The movement of electric charge drives the current in a circuit. The negatively charged atom-containing particles known as electrons are responsible for carrying electric charge. A power source, like a battery or generator, in a...
All atoms consist of protons, neutrons and electrons. The protons, which have positive electrical charges, and the neutrons, which have no electrical charge, are contained within the nucleus. Removed from the nucleus are minute...
Symbols are used for components in electrical circuit diagrams and some of the more common ones are shown in Fig. Read More Topics Electrical / electronic system block diagram Electrical potential and...
An electrical / electronic system is a group of components connected together to perform a desired function. Figure shows a simple public address system, where a microphone is used to collect acoustic energy in the form of sound...
