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## What is the output line voltage of a 3 phase?

The formula is volts times the square root of 3, which happens to be rounded off to **1.732**. For 2 lines each carrying 120 volts, the calculation for this is 120 volts times 1.732, and the result is rounded up to 208 volts. That’s why we call it a 208 volt three-phase circuit, or a 208 volt 3 phase line.

## How can the AC voltage at the output of a three phase PWM inverter be varied?

The output voltage of the inverter can be **modified by changing the DC-link voltage amplitude** or by changing the modulation index of the inverter by control circuit.

## How do you calculate voltage output?

The current flowing out of the power supply is just the **voltage (5 volts) divided by total resistance, I=V/R**, so: I=5R+RLED.

## What is the purpose of 3 phase voltage source inverter?

Single phase VSI is used for low power applications and three phase VSI is used for **medium to high power applications**. The main purpose of these topologies is to provide a three phase voltage source where the amplitude, phase and frequency of the voltage should always be controllable.