Increasing voltage increases the RPM of the motor, but what does increasing current do? Increasing Voltage, Increases the Current Pulled, which Increases the Strength of the coil, which increases the RPM AND Torque of the motor. They are all connected.

## What happens if you alter voltage?

The current is directly proportional to the voltage and inversely proportional to the resistance. Any alteration in the **voltage will result in the same alteration of the current**. So doubling or tripling the voltage will cause the current to be doubled or tripled.

## Does increasing voltage increase speed of DC motor?

Yes the speed of the DC motor is **increased by increasing the armature voltage**. Therefore, the speed of the motor is proportional to the applied DC voltage if the field flux is constant. The torque of the motor is proportional to the field flux and the armature current.

## What makes a DC motor faster?

Speed of a DC motor is **directly proportional with the induced emf in the armature terminal** and this induced emf is directly proportional with the supplied voltage…. So increasing supplied voltage causes more induced emf which makes the speed of the DC motor higher…

## How can the speed of a DC motor be controlled?

Thus, the speed of a DC motor can control in three ways: **By varying the flux**, and by varying the current through field winding. By varying the armature voltage, and the armature resistance. Through the supply voltage.

## Does changing frequency affect voltage?

The power system delivery frequency in an electrical system will affect inductive and capacitive reactance, and will have very little effect on purely resistive loads. It **will affect** the power factor of the delivered voltage.

## What happens if voltage is too high?

If the voltage is too low, the amperage increases, which may result in the components melting down or causing the appliance to malfunction. If the voltage is too high, this will **cause appliances to run ‘too fast and too high**‘ which will shorten their service life.

## Is RPM proportional to voltage?

Voltage is set by the supply. When spinning the motor generates an internal voltage called **back-emf**, which is proportional to rpm. The difference between the back-emf voltage and the supply voltage is dropped across the motor’s internal resistance (Rm), resulting in a current draw according to Ohm’s Law (I = V/R).