Contents
Do current sources have polarity?
As in the voltage source case, a current source already has a current flow. Therefore, you can only assume a voltage polarity of your choice. Solution: (1) Since the current flow is give at the right branch, we mark voltage polarity by the positive convention.
Does a Dependant current source have resistance?
Conversely, if the current through an ideal current source is determined by some other voltage or current in a circuit, it is called a dependent or controlled current source. Symbols for these sources are shown in Figure 2. The internal resistance of an ideal current source is infinite.
What are different dependent sources?
There are four possible dependent sources: the voltage-controlled voltage source (VCVS), the current-controlled voltage source (CCVS), the voltage-controlled current source (VCCS), and the current-controlled current source (CCCS).
What is the power of a dependent current source?
Assuming positive terminal placed on the node of , the voltage across the dependent current source is . The current flowing through the dependent current source is . Therefore the power of the dependent current source is .
How does the direction of the current relate to the polarity?
The direction of the current will correspond to the polarity of the corresponding voltage, flowing out from the positive terminal. The letter “i” is used to indicate that it is a current source as shown.
When is the terminal voltage dependent on the current source?
However, if the current source is the only source within the circuit, then the polarity of voltage across the source will be easier to establish. If however there is more than one source, then the terminal voltage will be dependent upon the network in which the source is connected.
How to write dependent sources in a circuit?
If there are dependent sources in the circuit, write down equations that express their values in terms of other node voltages. There is one dependent source, which is a current controlled current source. We need to write in terms of node voltages. is the current passing through the – resistor.