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# Assignment 1(Spring 2013)

Circuit Theory (Phy301)

Marks: 25

Due Date: April 29, 2013

DON’T MISS THESE Important instructions:

• To solve this assignment, you should have good command over first 6 lectures.
• Upload assignments properly through LMS, (No Assignment will be accepted through email).
• All students are directed to use the font and style of text as is used in this document.
• Don’t use colorful back grounds in your solution files.
• Use Math Type or Equation Editor etc for mathematical symbols.
• This is not a group assignment, it is an individual assignment so be careful and avoid copying others’ work. If some assignment is found to be copy of some other, both will be awarded zero marks. It also suggests you to keep your assignment safe from others. No excuse will be accepted by anyone if found to be copying or letting others copy.
• Don’t wait for the last date to submit your assignment.
• You can draw circuit diagrams in “Paint” or in “Corel Draw”. The simple and easy way is to copy the given image in Paint and do the required changes in it.

Q 1:

Find the equivalent resistance RT of given circuit. Write each step of the calculation to get maximum marks. Draw the circuit diagram of each step otherwise you will loose marks.

Q 2:

Determine the voltage and current across each resistor for the given circuit. Mention the units of calculated value.

Q 3:

1.               I.      Why a crow sitting on high voltage bare line, does not get electric shock?

1.            II.       A 100 Watt light bulb operates on 140V.How much current does it require?

1.          III.      Write the names of different instruments/devices used to measure the voltage and current across a circuit element & way know to connect them.

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### Replies to This Discussion

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

then do discussion no time

Question 1

Answer is RT = R1 + R2                 =4.87Ω + 5Ω   = 9.87Ω

Question 2

a0)  total current in circuit

I = V/R =12/6   =2 mA

b)  voltage accros each resistor  8v and 4v according to formula v = IR

Question 3

question 2 mai current b tow each resistor sy honi thi na

question 1 b explain kr do

koi help kry ga?

Q 1:

Find the equivalent resistance RTof given circuit. Write each step of the calculation to get maximum marks. Draw the circuit diagram of each step otherwise you will loose marks.

Q 2:

Determine the voltage and current across each resistor for the given circuit. Mention the units of calculated value.

Q 3:

I.      Why a crow sitting on high voltage bare line, does not get electric shock?

Solution:

High above the ground, electrical and telephone poles and their connecting wires must seem made for birds, like artificial trees with limbs that stretch on forever. Sometimes a hundred birds will be stretched out along a wire, in a kind of high-tension convention.

How come a bird on a wire doesn’t get shocked? When the bird perches on a live wire, her body becomes charged–for the moment, it’s at the same voltage as the wire. But no current flows into her body. A body is a poor conductor compared to copper wire, so there’s no reason for electrons to take a detour through the bird. More importantly, electrons current flow from a region of high voltage to one of low voltage. The drifting current, in effect, ignores the bird.

But if a bird (or a power line worker) accidentally touches an electrical “ground” while in contact with the high-voltage wire, she completes an electrical circuit. A ground is a region of approximately zero voltage. The earth, and anything touching it that can conduct current, is the ground.

Like water flowing over a dam into a river, current surges through the bird (or person’s) body on its way into the ground. Severe injury or death by electrocution is the result.

That’s why a squirrel can run across an electrical line, but sadly die when its foot makes contact with the (grounded) transformer on the pole at wire’s end.

It’s also why drivers and passengers are warned to stay inside the car if it runs into a downed power line. Touching the ground with your foot would complete the circuit: Electrons would flow from the wire, into the car, and through you on their way into the earth. (Inside the car you are usually protected by the car’s four rubber tires, which act as insulators between car and ground.)

Likewise, birds can get in trouble with power lines if wing or wrist bones–or wet feathers–connect bare wires and grounds.

Raptors (birds of prey) are especially likely to be killed by power lines, particularly in the western U.S. In wide-open plains and deserts, power poles are often the only high perches available for hunters like Bald and Golden eagles and Great Horned owls, who survey the landscape for prey and take off into rising wind currents.

Such large birds can easily contact two wires or a wire and a transformer with their great wingspread. And raptors can easily brush against a live wire while settling onto a (grounded) pole-top. Thousands are killed by power lines each year.

How to protect big birds? Power lines can be made less dangerous by widening the gap between conducting and ground wires, insulating wires and metal parts, and moving wires farther away from pole tops. And guards can be built around favorite raptor perches.

II.       A 100 Watt light bulb operates on 140V.How much current does it require?

III.      Write the names of different instruments/devices used to measure the voltage and current across a circuit element & way know to connect them.

Question 1

Answer is RT = R1 + R2                 =4.87Ω + 5Ω   = 9.87Ω

Question 2

a0)  total current in circuit

I = V/R =12/6   =2 mA

b)  voltage accros each resistor  8v and 4v according to formula v = IR

Question 3

Ist Question answer is 9.58 ohms. 100% confirmed.

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