Dana .A.Al Freeh: NameQualification: Master physicsSolids state: Department

بسم الله الرحمن الرحيم

OHM’S LAW-1

Name of experiment

objective

To study Ohm’s law applied to a “linear DC circuit.

OHM’S LAW

Theory

Ameter(I):The device to measure

I(curent)

Voltmeter(V): The device tomeasure voltage(v) volmeter

V=I R

(R)is resistance Ὼ

Data

R=V/I I(A) V(v)

1

2

3

4

7

6

8

Graphing

I(A)

V(volt)

Slope(V1,)2V)

Slope=

Dana .A.Al Freeh: NameQualification: Master physicsRoom NO: 209\14DSolids state: Department

بسم الله الرحمن الرحيم

OHM’S LAW(1)

Name of experiment

objective

To study Ohm’s law for parallel and series circuit.

objective

Theory

Series:series

Theory

PARALLEL

series

Data Table

R=V/I I(A) V(v)

series

R=V/I I(A) V(v)

Graphing

I(A)

V(volt)

Slope(V1,)2V)

Slope= 𝑹𝒔=𝑹𝟏+𝑹𝟐

R=V/I I(A) V(v)

(I1,)2I)

Graphing

I(A)

V(volt)

Slope(V1,)2V)

Slope=

R=V/I I(A) V(v)

𝑹𝑷=𝑹𝟏𝑹𝟐

𝑹𝟏+𝑹𝟐

In the end

OHM’S LAW(2)

Name of experiment

objective

To study Ohm’s law as applied to a “ linear “ DC circuit .To show the behavior of some “ non-linear “ circuit elements which do not obey Ohm’s law .

Theory

Ohm’s law

Theory

R is resistance at the final.

is resistance at the initial.

T is Temperature at final .

is Temperature at initial .

Data Table R=V/I Ω

I(A) V(v)

Data Table

Graphing

I(A)

V(volt)

Non -linear

conclusion

Evident from the graph non-linear relationship between voltage and current, and this is evidence that the part of the battery is consumed as energy and thermal part of the lighting.

In the end

Measurement of thickness of a very thin sample

Name of experiment

objective

Part (1) Part (1)

Objective ObjectiveTo estimate the number of atoms in the thickness of pencil line

n= t/2X10^-10

Calculate the resistivtyof

pencil=R A/L

objective

Meaning physicist Symbol

()Reisstance R( .m)Resistivity

Length (m) LThe area of cross-section( A

Thickness (m) tWide (m) WNumber of atoms nradius rdiameter d

Theory

8cm

R=8ᾩ

ᵨ ᵨᵨᵨᵨᵨ ᵨᵨ

ᵨ: ResistivityR: resistance

Theory

.

t = ᵨ L / WR

ᵨLR

W= 2mm (Diameter )

Diametern = t \ 2X10^-10

=R A/L

Theory

=R

R=

t =

In the end

Dana .A.Al Freeh: NameQualification: Master physicsDepartment: Solids stat209-14D: ROOM No

بسم الله الرحمن الرحيم

Name of experiment•Wheatstone bridge

objetive

1-To introduce bridge circuits null detection method to measure the resistance of a conductor.

2 -To measure the resistivity of several conductors.

3 -To determine the variation of the resistance of a conductor

with its length and crosssectional area.

Theory

8cm

R=8ᾩ

ᵨ ᵨᵨᵨᵨᵨ ᵨᵨ

Theory

𝑰𝟏

𝑰𝟐

=Theory

𝑅2 𝑅3

𝑹𝑿

POWER SUPPLY Keya b

𝑹𝟐=𝝆 𝒂𝑨

𝑹𝟑=𝝆 𝒃𝑨

Theory

𝑹𝒙=𝒃𝒂𝑹𝟏

X100%

(A=3.3X , L=0.1cm)

Dana .A.Al Freeh: NameQualification: Master physicsDepartment: Solids stat209-14D: ROOM No

بسم الله الرحمن الرحيم

Group (1)100 R1

a= 6650 Rtho

b =? Rx

? Error=

Group(2)

100 R1

a= 65.5

50 Rtho

b =? Rx

Home Work

Name of experiment•SLIDE-WIRE POTENTIOMETER

objetive

Part(2) Part(1)

To measure the (emf) of an unknow (εx) cell usuing the slide wire

potentiometer(emf=Electro magntic

field)

To establish the linear voltage(V)

/ displacement(L)

relation ship of the potentiometer

Theory

Part(2) Part(1)Ex=I Rx

Es= I Rs

Equal (I) Ex = Es Rx\ Rs

Rx=ῥ Lx\A ,Rs=ῥLs\AEx=Es Lx\Ls

V= I RR= ᵨ L \AV=I ᵨ L \A

Theory

Part(2) Part(1)

L

+ -Power supply

v

+ -Power supply

G

+ -

Lx or Ls

Theory

Part(1)

V L102030

100

Theory

Part(2) Part(1)

εs= 1.5vLs=Lx εs\εxεx

Lx

V(v)

L(cm)

`

Ex=Es Lx\Ls

In the end

Error•Error ε=[εs-εx]/εs X100

Name of experiment•Speed of sound in air

objetive

•To study sound wave resonances in air columns and to

measure the velocity of sound in air.

Theory

((Maximume sound

Theory

Theory

V= f λV=velocity(m/s)

f = The frequency(cycle)λ = wavelength(m)

Theory

•V= 4F [L +(0.3)d]•d= diameter of tube

TheoryV= 4F [L +(0.3)d] d(m) L(m) L(cm) F(CYCLE)

In the end