Multimeter is an instrument that measures electric equipotential. Equipotential lines can be determined by connecting various points of electric potential or voltage.
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A heightometer.
The instrument used to measure electrical current is called an ammeter, which is actually a shortened form of 'amp meter'. The current is measured in amperes. In scientific labs, a much more sensitive instrument called a galvanometer is used to measure very small currents.
The angle is a right angle.
hot wire ammmeter or a moving iron ammeter will work for ac and dc.
in an electric circuit, it is treated as a reference from which other voltages can be measured. also it acts as a common return path of electric current leakages