basic 3 min read
Magnetic circuits
Magnetic fields A permanent magnet is a piece of ferromagnetic material (such as iron, nickel or cobalt) which has properties…
THE LATEST THINKING
Every story.
Browse our articles in publication order, with new stories added automatically.
basic 1 min read
Capacitance
Capacitors Every system of electrical conductors possesses capacitance. For example, there is capacitance between the conductors of overhead transmission lines…
basic 2 min read
Capacitors and capacitance
Electrostatic field Figure 6.1 represents two parallel metal plates, A and B, charged to different potentials. If an electron that…
basic 1 min read
Potential divider
The voltage distribution for the circuit shown in Figure 5.5(a) is given by
basic 5 min read
Primary cells
Primary cells cannot be recharged, that is, the conversion of chemical energy to electrical energy is irreversible and the cell…
basic 3 min read
Chemical effects of electricity
A material must contain charged particles to be able to conduct electric current. In solids, the current is carried by…
basic 1 min read
Temperature coefficient of resistance
In general, as the temperature of a material increases, most conductors increase in resistance, insulators decrease in resistance, whilst the…
basic 3 min read
Potential difference and resistance
For a continuous current to flow between two points in a circuit a potential difference (p.d.) or voltage, V, is…
