Ammeter connected directly across a voltage source since their internal resistance is very low and excess current would flow. Ammeters are designed for a low voltage drop across their terminals, much less than one volt; the extra circuit losses produced by the ammeter are called its "burden" on the measured circuit. Ordinary Weston-type meter movements can measure only milliamperes at most, because the springs and practical coils can carry only limited currents. To measure larger currents, a resistor called a "shunt" is placed in parallel with the meter. The resistances of shunts is in the integer to fractional milliohm range. Nearly
Edmundson Electrical Electrical Distributors, which in 2010 was the fifth largest private company by revenue ($3.4 billion in 2009, $3.9 billion in 2008). Through a number of companies, the Colburn family own a global network of manufacturers, distributors and general purpose retail outlets. Whilst Edmunson Electrical primarily serves the United Kingdom and Ireland, the parent organisation, Marlowe Holdings Investments has an 80.1% stake in the Mainland Europe based preformed plastics distributor, Vink Holdings. Edmundson Electrical Edmundson Electrical Ltd is a privately held electrical distribution company headquartered in Knutsford, Cheshire, incorporated in 1991. It is the largest electrical distributor in the United Kingdom