Last edited 29 Jul 2021

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BSRIA Institute / association Website

Electric current

The Illustrated Guide to Electrical Building Services, Third Edition (BG 32/2014), by David Bleicher & Peter Tse, published by BSRIA in 2014, states; ‘An electric current is a flow of charged particles. In electrical systems in buildings, the charged particles are normally electrons, flowing in conductors such as cables. In order for a current to flow, a voltage must be applied and a complete electric circuit must exist.

‘Current is measured in amperes – normally shortened to amps or A. One amp of electric current equates to 6.25 million million million (6.25 × 10^18) electrons moving past a point in one second. The safe current carrying capacity of cables is generally measured in amps, and hence so are ratings of circuit protection devices, for example a 13 A fuse.’


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