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Since ten thousand ohms is equal to one-hundredth of a megohm, the time-constant would be equal to one-ten-thousandth of a second, and ten times this time-constant would be equal to a thousandth of a second.

Convenient multiples and subdivisions of the ohm are the microhm and the megohm, the former being a millionth part of an ohm, and the latter a million ohms.

If it has a million ohms we say it has a “megohm” of resistance.

Usually I interpose an external resistance varying from one to five megohms according to the sensitiveness of the wire.

In telephone cables, an insulation resistance of 500 megohms per mile at 60° Fahrenheit is the usual specification.