What are voltage sources and current sources?
A voltage source is a two-terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current. However, a real-world voltage source cannot supply unlimited current. A voltage source is the dual of a current source.
What is the voltage across the first 10 ohm resistor?
Ohm’s Law says that the current I = V / R. The voltage across the whole circuit is 12 volts, and the total resistance is 10 ohms. The answer is I = 12 / 10 = 1.2 amperes.
How many resistors are there in parallel with 30V?
In parallel with the 20K you basically have an equivalent 3.158K resistor in parallel with the 30V source. You can see that any equivalent resistance value will have no effect on the the network to the right of the ideal voltage source. Click to expand… This makes complete sense!
Is the current source the same as the voltage source?
The only connection of that pair to the circuit is at the two nodes of an ideal voltage source that locks those nodes at a 30V differential – the current source can’t change that voltage. The terminals of the 30V voltage source, along with the 10ma current source, drive all the currents and voltages in the network to the right of the 30V source.
Which is a source of a constant current?
A current source is a source that provides a set amount of current by varying its voltage. It’s usually represented by the symbol below: In this case, the idea of a DC or AC voltage doesn’t apply as the current source will produce whatever voltage is necessary to keep a constant current, whether that voltage is positive, negative, or varying.
Can a current source be removed from a circuit?
The solution stated that the 8mA current and the 20kOhms resistor have no effect on the circuit with respect to terminals a,b and, hence, can be removed. From what I can understand, an ideal current source will take on any value of voltage and vice versa; so the 8mA current source will act the same as a 30v voltage source in place.