You measure electric current and voltage
easily by using multimeters.
They are inexpensive, widely used
and can easily switch between a current, voltage and resistance meter.
A distinction is made between digital and
With digital multimeters the measured value is displayed
as a numerical value using an analog-digital converter.
With analog multimeters the measured value is
displayed on a moving coil meter.
Using a rotary switch you are able to select
between several measured values
and measurement ranges...
Circuit symbol ammeter.
Circuit symbol voltmeter.
Circuit symbol ohmmeter.
An ammeter measures the electric current in
Ampere [A] and displays a positive reading when
the current flows from
the positive (+) to the negative (−) terminal.
A voltmeter measures the voltage in Volt [V]
and displays a positive reading when the electric potential
at the positive (+) terminal is higher than at the
negative (−) terminal.
An ohmmeter measures the electric resistance
in Ohm [Ω]
and always shows a positive reading.