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# Assignment 1(Fall 2015)

Circuit Theory (PHY301)

Marks: 30

Due Date: November 12, 2015

DON’T miss these important instructions:

• To solve this assignment, you should have good command over first 6 lectures.
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• You can draw circuit diagrams in “Paint” in “Corel Draw” or in circuit maker. 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 lose marks.

Q 2:

Find the current through each resistor and power dissipation across 20kΩ Resistance. Write each step of the calculation to get maximum marks and also mention the units of each derived value.

(a)    Is it right to say that every short circuit is a close circuit while every close circuit is not short circuit. Justify your answer

(b)   What is the use of circuit breaker and Fuse in electric panel/wiring?

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

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### Replies to This Discussion

First 2 ki he li hy phly smaj to lea karo kay aik aik line kay sath comment denay parain gay ab handout may example dekh lo

Bhai ager 5 ya 5 say bara digit ho to to phir krtay hain 1 add khair main answer phir b wohi ata hy is leay behas na karain my nay first time post ki hy ya so bewaja baat pay larna nhi chahta

zrori ni ha 5 se bara ho tb hi ki jaaey aap below numbers ko b likh sktey ho. This is electric circuit so a minor change not matter.

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 lose marks.

The total resistance of circuit is=

4+2 of two series resistances = 6 ohm for above mentioned circuit.
Then total of above circuit = 6*6/6+6= 3 ohm
The total resistance for this part is= 4*4*4/4+4+4= 1.34 ohm

Resistance of this part is 1+1.34+5 = 7.34

Resistance of this part is 3+1+3= 7

Resistance of this part is 7*7.34/7+7.34= 3.58
Thus after redesigning whole circuit it will be
The total resistance of whole circuit is= 5+3.58+1= 9.58 ohms

Q 2:
Find the current through each resistor and power dissipation across 20kΩ Resistance. Write each step of the calculation to get maximum marks and also mention the units of each derived value.

(a) Is it right to say that every short circuit is a close circuit while every close circuit is not short circuit. Justify your answer
Answer: The circuit where both terminals are connected in a loop is called a close circuit. The circuit having a load/resistance also a close circuit but due to resistance we can’t transmit maximum amount of current from one terminal to other. On the other hand where both terminals connected in loop but resistance between both terminals is approximately zero then we can say this is a short circuit.
As we saw the loop with a load also is a close circuit and short circuit is also closed by keeping this in mind we can say every short circuit is closed and every closed circuit is not a short circuit because the close circuit may have a load b/w both terminals.
(b) What is the use of circuit breaker and Fuse in electric panel/wiring?
Answer: We use circuit breakers and fuses in electric panel/wiring to save appliances from over amount of current to pass from them. As every electrical equipment bear a certain amount of current in case when over current moves in the circuit of equipment it may damage the equipment. To avoid such condition we use fuses and breakers the fuse melt down when over current try to pass from it by this the circuit break down and turn the supply off to save electric appliances. The same purpose of breaker it switch off when current or exceed a certain value.
© Write the names of different instruments/devices used to measure the voltage and current across a circuit element & way to connect them.
Volt Meter: We use volt meter to measure amount of voltages in a circuit. We connect volt meter in parallel to measures voltages as the voltages remain same in a parallel circuit.
Ampere meter:
Ampere meter is used to measure the amount of current in circuit as we know that current remain same in series so we connect ampere meter in series to check amount of current in a circuit.

Thanks Tariq Bahi.

This was a demo that why i write it as 4*4*4/4+4+4=1.34 so please do not confuse and concentrate on examples of lectures. Just do it in parallel of two two circuits each time take two and then calculate answers with next resistance.

one calculation is wrong in 1st question in the 2nd step when we multiply 4x4x4 the is equal to 64 and 4+4+4=12 so after division it will be 5.32

Ammeter: Measures current
Audio analyzer : Analyzes (analog and digital) systems handling audio signals
Capacitance meter: Measures the power factor
Distortionmeter : Measures the distortion added to a circuit
Electricity meter: Measures the amount of energy dissipated
ESR meter : Mesures the equivalent series resşstance of capacitors
Frequency counter: Measures the frequency of the current
LCR meter: Measures the inductance, capacitance and resistance of a component
Microwave power meter: Measures power at microwave frequencies
Multimeter: General purpose instrument measures voltage, current and resistance (and sometimes other quantities as well)
Network analyzer: Measures network parameters
Ohmmeter: Measures the resistance of a component
Oscilloscope: Displays waveform of a signal
Psophometer: Measures AF signal level and noise
Q meter : Measures Q factor of the RF circuits
Signal analyzer: Measures both the amplitude and the modulation of a RF signal
Signal generator: Generates signals for testing purposes
Spectrum analyser: Displays frequency spectrum
Sweep generator Creates: constant-amplitude variable frequency sine waves to test frequency response
Transistor tester: Tests transistors
Tube tester: Tests vacuum tubes (triode, tetrode etc.)
Wattmeter: Measures the power
Vectorscope: Displays the phase of the colors in color TV
Video signal generator: Generates video signal for testing purposes
Voltmeter: Measures the potential difference between two points in a circuit.
VU meter: Meaures the level of AF signals in Volume units
guys in me se kon kon se use hoty ha current aur voltage measure karni k ly ??????
i have done my assignment ....yahooo

koi tey solution send kar deo yar aj last date hai assignment ki......................................... please

Q. 1

Find the equivalent resistance RT of given circuit.

The equivalent resistance of resistors in series equals the sum of the individual resistances of the resistor. Equivalent Resistance for Resistors in Series R = RA +RB +Rc and The equivalent resistance of resistors in parallel equals the sum of the Equivalent Resistance for Resistors in Parallel R=1/R1+1/R2+1/R3.

PHY301 Assignment#01 Solution

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Thanks Tariq Bhai

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