Voltage is measured with an instrument called voltmeter.Voltmeter can be adjusted to show many ranges,depending on the voltages they are to be used to measure.
A voltmeter can be used to measure voltages anywhere in circuit.When it is used to measure a source of e.m.f such as a battery, the negative side of the voltmeter mudt be connected to negative side of the battery, and the positive side of the voltmeter to the positive side of the battery.
When a voltmeter is used to measure the voltages a cross a load, the negative probe is connected to the side of the load into which electron enters and the positive probe is connected to the side of the load from which electrons emerge.
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