how fast can a fan go with one volt and so on, up to 8 volts?

Question

it does not have to be exact, i need some numbers for each voltage.

Answer 1

It is proportional to the size of the motor.
Generally, the smaller the motor the faster it will go, but
there really is no limit.

It would be like asking how fast a car would go with a lawn mower engine with 8 gallons of gas?
(In this case we at least know it is a lawn mower engine)

You first need to specify what kind of motor you are using.

Answer 2

You really need more information.

An electric motor has wires wound in a coil. When current goes through the wire a magnetic field is created that pulls the armature toward a another magnetic field.

There are a lot of different electric motors.

In general, if a small DC motor turns at 1 rpm at 1 volt it might turn at 8 rpm with 8 volts if it was designed correctly. That is assuming a very efficient motor. So the more voltage the faster it goes until it flies apart or burns up.

You really need more information to get a good answer.

Answer 3

It would have to be a very small fan. Fans used in your house use 120 Volts AC. Fans in your car use 12 Volts DC. So in the case of the house fan, the fan would not even move with 8 volts applied. In a Car the fan would run very slow on 8 volts, and it might even be danaged by the low voltage. If you had a fan designed to run on very low volts. Say a fan running on 1 volt, then that fan would run much faster on 8 volts. Lets see
Power = Volts * Current for DC and single phase applications.

Answer 4

from Comair Website: Each fan is different in the range of input voltage to fan speed. The rule of thumb is a zero voltage input will result in a minimum speed condition and an input equal to 50% of the fans nominal voltage will result in a maximum speed condition. For instance, a 24 Vdc fan will operate at full speed when 12 Vdc is applied to the program lead.

The answer to your question depends on the specific fan that you are using.