Use a multimeter that has both scales on it . All you need to do is change the scale from AC to DC
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You mean fastest? Digital voltmeter gives reading in seconds.
Digital voltmeter has high input impedence.
A voltmeter has the large resistance.The voltage across any component can be measured if & only if the terminals of that component will be open and this will we can acheiv if we connect the high resistance voltmeter across the open terminals of that component to measure the voltage.
Assuming you're referring to a simple incandescent bulb . . .When the bulb burns out, the filament is open, and it is electrically no longer there.The voltmeter is then across the battery, which is open circuited, i.e. without a load.The meter measures the open-circuit voltage of the battery, nominally 6 V.
Here we will just connect DC generator shaft with motor's rotating spindle. Now connect voltmeter across dc gen. and just calibrate voltmeter in terms of rpm. If you have worked with micro-controllers then it will be very easy using it's ADC input.