What's The Difference Between Shunt, Bus, and Load Voltages
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Please be positive and constructive with your questions and comments.
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MaxMaeder
- Posts: 4
- Joined: Sun Oct 29, 2017 5:49 pm
What's The Difference Between Shunt, Bus, and Load Voltages
I have bought an INA219 current monitor through Adafruit. However, I am confused what the difference is between shunt, bus, and load voltages on the sensor.
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adafruit_support_bill
- Posts: 88922
- Joined: Sat Feb 07, 2009 10:11 am
Re: What's The Difference Between Shunt, Bus, and Load Volta
The bus voltage is the total voltage between power and GND. It is the sum of the load voltage and the shunt voltage.
The load voltage is the voltage going to the load.
The shunt voltage is the voltage drop across the shunt resistor that is in series with the load.. That is how the sensor measures the current.
Since current obeys Ohm's Law, the voltage drop across the shunt resistor is proportional to the current flowing through the circuit. And since the resistance of the shunt is known, it is easy to calculate the current.
The load voltage is the voltage going to the load.
The shunt voltage is the voltage drop across the shunt resistor that is in series with the load.. That is how the sensor measures the current.
Since current obeys Ohm's Law, the voltage drop across the shunt resistor is proportional to the current flowing through the circuit. And since the resistance of the shunt is known, it is easy to calculate the current.
Please be positive and constructive with your questions and comments.