Question about current sense

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In summary, the conversation discusses a confusing circuit problem where the direction of current is reversed in the solutions manual. The speaker asks why this is the case and if the problem can be solved in both ways. The expert summarizer explains that the negative sign indicates the current is positive in the reverse direction and that the problem can be solved in both ways as long as the sign convention is kept in mind.
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Hi. It's me again with another confusing circuit problem. The first attached image below shows ib going from right to left through the 11Ω resistor and ib is given -2A. In the solutions manual of the book, it has reversed the direction of the current as in going from left to right and taken the value 2A.
My questions is, why has the solutions manual reversed the direction and not just solved it from left to right and taking the current -2A? Could it be solved it both ways?
 

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  • #2
The current always flows from +ve terminal to -ve. The negetive sign just indicates that current is positive in the reverse direction (in other words it is flowing in the reverse direction). Since ib is given as -2A it is saying that the current is 2A in the reverse direction (which is indicated in the solution manual). It could be solved in both ways. Just keep in mind the sign convention.
Regards
 
  • #3
Aha. Thanks for the answer.
 

What is current sense?

Current sense is a method used to measure the amount of electrical current flowing through a circuit or electronic device. It allows for monitoring and controlling the flow of current, which is essential for efficient and safe operation.

Why is current sense important?

Current sense is important because it allows for the detection of any abnormalities or malfunctions in a circuit or device. It also enables the precise control of current, which is essential for protecting components and ensuring proper operation.

How does current sense work?

Current sense works by using a sensing element, such as a resistor or a magnetic field sensor, to measure the voltage drop across a known resistance in the circuit. This voltage drop is directly proportional to the current flow, allowing for accurate current measurement.

What are the different methods of current sense?

There are several methods of current sense, including shunt, Hall effect, and transformer-based sensing. Shunt sensing involves measuring the voltage drop across a known resistor, while Hall effect sensing uses a magnetic field sensor. Transformer-based sensing uses a current transformer to measure the current flow.

What are some common applications of current sense?

Current sense is commonly used in power supply circuits, motor control systems, battery chargers, and electronic devices. It is also used in automotive systems, industrial equipment, and renewable energy systems, among others.

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