I. Introduction
Electricity problems seem to be everywhere in our daily lives. Whether it's at home or at work, we all need a stable and reliable power supply**. So, for a device with a power of 11 kilowatts, how big should we choose? Let's take a look at this question together! 
2. Understand the relationship between power and current
First, we need to understand what power is and how it relates to current.
Power is a measure of how fast energy is converted per unit of time, that is, it is the product of voltage and current. The formula is as follows:
p=vi where p is the power (in watts), v is the voltage (in volts), and i is the current (in amps).
3. Calculate the required voltage regulator capacity
Knowing the relationship between power and voltage, we can calculate the required regulator capacity based on actual needs.