Ammeter in both vanes, the vanes repel each other and the moving vane deflects against the restoring force provided by fine helical springs. The deflection of a moving iron meter is proportional to the square of the current. Consequently, such meters would normally have a non linear scale, but the iron parts are usually modified in shape to make the scale fairly linear over most of its range. Moving iron instruments indicate the RMS value of any AC waveform applied. Moving iron ammeters are commonly used to measure current in industrial frequency AC circuits. In a hot-wire ammeter, a current passes
Jim Measures Jim Measures James Measures (born 14 April 1939), also known by the nickname of "Jim", is an English former professional rugby league footballer who played in the 1950s and 1960s. He played at representative level for Great Britain, and at club level for St Helens, Widnes and the Rochdale Hornets, as a , i.e. number 11 or 12, during the era of contested scrums. Measures was born in St. Helens, Lancashire, England. Jim Measures won caps for Great Britain while at Widnes in 1963 against Australia (2 matches). Jim Measures played left-, i.e number 11, in Widnes' 13-5 victory over