Determine the power of each source.
a)

b)

Solution
a) The current source keeps the current of the loop $2A$ and the voltage source keeps the voltage across the current source $3v$ as shown below.

For the voltage source the current enters from the positive terminal. Therefore, the passive sign convention should be used to find the sign of power:
$P=V \times I= 3 \times 2 =6W > 0$ absorbing power
For the current source, the current leaves from the positive terminal. Hence, the active sign convention should be used:
$P= - V \times I= - 3 \times 2 =-6W < 0$ supplying power

b) Similarily, the voltage across the current source and the currentpassing through thevoltage source can be easily determined by voltage and current sources, respectively:

For this problem, the current enters to the voltage source from the negative terminal. Thus, the active sign convention should be used:

$P=-V \times I= -3 \times 2 =-6W 0$ absorbing power

Hi! Yaz is here. I am passionate about learning and teaching. I try to explain every detail simultaneously with examples to ensure that students will remember them later too.

## Join the Conversation

1. thirulok says:

sir,
whats the main difference of absorbing power and supplying power??
mainly here, the circuits consists of 2 SOURCE..... which one is absorb the power from other???

1. Would you please clarify your question? In circuit a, the voltage source is absorbing current from the current source. In b, the current source is absorbing power from the voltage source.

1. I think at the last line of the solution there is a mistake, you should complete the solving

1. What is the mistake?

2. salahuddin says:

if i m not wrong . Example, Absorbing power = when u connect source to battery, & supplying power = when u charge battery,

2. Dhruv says:

i am totally confused when there is a voltage source and a current source in a circuit

1. Mohamed says:

Me too