# Circuit Analysis

Thread Starter

#### tyw

Joined Sep 8, 2020
2
For Question 2.1, is the power 500W or 100W ? Do we need to apply the passive sign convention rule for power in whatever cases? Also, i’ve Learnt that we can check answers by balancing power in a circuit. But the power in this kind of circuits don’t balance out, but it is still valid. So when can we use “balancing power” technique to check for our answers? And why can’t the power balances in this case?

Please send help and explanation >.<

Thanks a lot! Have a great day!

Last edited:
Thread Starter

#### tyw

Joined Sep 8, 2020
2
View attachment 216663For Question 2.1, is the power 500W or 100W ? Do we need to apply the passive sign convention rule for power in whatever cases? Also, i’ve Learnt that we can check answers by balancing power in a circuit. But the power in this kind of circuits don’t balance out, but it is still valid. So when can we use “balancing power” technique to check for our answers?

Last edited:

#### ericgibbs

Joined Jan 29, 2010
13,585
hi tyw,
As this is homework, please post your best attempt at answering the question, we can then help.
E

#### Irving

Joined Jan 30, 2016
2,058
You need to apply KVL to the circuit. In 2.1 walk round the circuit calculating the voltage, paying careful attention to the signs... what is the residual PD and its direction?

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