| 摘要 |
A simple and inexpensive instrument for measuring electric current that may be mounted on existing current-carrying conductors to provide a ready visible indication of the current flowing through the conductor. The instrument comprises an outer transparent tube mounted coaxially with the current-carrying conductor, a number of O-rings mounted within the tube and spaced along the length of the tube to form different compartments along the instrument, and a number of differently colored tubular indicators respectively forming the inner walls for the compartments, with each compartment being filled with a material, such as paraffin wax, which melts at a different temperature from the material in the other compartments, to become transparent and reveal the corresponding colored inner indicator, when the current in the conductor heats the conductor to a particular temperature.
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