1. Which of these are parallel and serial? Calculate the total resistance. 2. Th

Question

1. Which of these are parallel and serial? Calculate the total resistance.

2. The current through R3 is 2 amps, calculate the total current from the source (U) and the voltage to U

Need some help with these, Can you guys explain in detail.
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I have tried to answer them, the answer i got for

1: The total resistanse is 40 ohms

2:
R3:
30 ohms
2A
U = 30 *2 = 60 V

R1:
5 OHMS
2A
U = 10 V

R2:
15 OHMS
2A
U = 30V

TOTAL:
RES = 40 OHMS
2A
U = 40 *2 = 80 V

The problem is that U is giving 40 V but R1+R2+R3 = 10V+30V+60V = 100V. How are the restanses taking more than what the main source is giving, i must have made a mistake somewhere.

Explanation / Answer

1: The total resistanse is 40 ohms

this one is correct

2:
R3:
30 ohms
2A
U = 30*2=60

here it is wrong

wen current through R3 is 2

this means this parallel circuit have potential difference=60V

this means current through R4 &R5 =60/45+15=1A

so net current from source=2+1=3A (ans)

R1:
5 OHMS
3A
U = 15 V

R2:
15 OHMS
3A
U = 45V

TOTAL:
RES = 40 OHMS
3A
U = 40 *3 = 120 V

now the source is 120 V and drop is also 120 V .

hope u r satisfied now and understood it

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