OHMS
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Anagrams
Examples
A horn loaded speaker can have a sensitivity as high as 110 dB at 2.83 volts (1 watt at 8 ohms) at 1 meter.
Advertisement - The Electrician, 1st June 1934 Between the mid 1930s until the 1950s, 1000 ohms per volt became a de facto standard of sensitivity for radio work and this figure was often quoted on service sheets.
And if the movement resistance is 1000 ohms, for example, R1 must be adjusted to 4.525 ohms.
Again for the case of a hypothetical 1 mA, 500 ohm movement on a 1 ampere range, the shunt resistance would be just over 0.5 ohms.
As an example, a meter movement that required 1 milliampere for full scale deflection, with an internal resistance of 500 ohms, would, on a 10-volt range of the multimeter, have 9,500 ohms of series resistance.
An improved version of 1927 increased this to 13-ranges and 166.6 ohms per volt (6 mA) movement.