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Series and parallel circuits

  • Thread starter Max CR
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  • #1
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2.Two resistors of 5 ohms and 20 ohms are connected in parallel across an ideal source of 20 V. The current supplied by the source is

a) .4 A, B) 5 A c) 20 A d) 1 A e) none of these

My work
R1 = 5 ohms
R2 = 20 ohms
V = 20 v
I = ?

V = IR
V/R = I = 20 V / 114 ohms = 80 amps


3. Homework Statement [/b]
Two 2 ohm resistors are in parallel. What is their equivilant resistance?

1/2 ohms + 1/2 ohms = 1 ohm. Is this correct?


4)A 20 volt potential is applied across a series combination of a 10 ohm and a 30 ohm resistor. The current in the 10 ohm resistor is a) .5 amps, b) .67 amps c) 1.0 amps d) 2.0 amps

P = I^2R
I = THE SQUARE ROOT OF (R/P)
I = THE SQUARE ROOT OF (10 ohms/20 V)

5) a 120 volt home electrical socket has 3 wires. How many of these wires would give yo ua shock if you were grounded when yo utouched them one wire at a time?

a) one b) two c) three

I think it is one.
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
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For 2 you need to use the relationship that

1/Req = 1/r1 + 1/r2

No idea where your 114 came from.
 
  • #3
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Woudl anyone mind showing me and hleping me solve these problems?
 
  • #4
LowlyPion
Homework Helper
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Woudl anyone mind showing me and hleping me solve these problems?
I've already helped you with 2).

Doing the problems for you isn't exactly going to help you learn the material.
 
  • #5
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THanks anyways i got help on Yahoo Answers
 
  • #6
LowlyPion
Homework Helper
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THanks anyways i got help on Yahoo Answers
As long as you get to uplink to Yahoo Answers for your exams you'll be all set then.

Good luck.
 
  • #7
CompuChip
Science Advisor
Homework Helper
4,302
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THanks anyways i got help on Yahoo Answers
Just to be completely scientifically accurate: you mean you got answers at Yahoo Answers. Which is good, I suppose, since that's what the name claims they'll give you.

As LowlyPion said, good luck on your exam.
 

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