I = current Q = net charge flowing t = time
1A 1C 1s

Unit: Q = Coulomb (C) I = Ampere (A) t = Second (s) Potential difference

Work done to move a unit charge from one point to another V W Q

Unit Volt 1 Volt
1 joule 1 coulomb 1V 1J C
1

Ohm’s law Current potential difference V I V = IR (R = resistance) Unit (R) 1 1V 1A

(Ohm)

Factors on which resistance depends 1. 2. R R l, when A and material constant l = length A, when l and material constant A = perpendicular cross-section

R R

l A l A

(

= resistivity)

Unit ( ) m Resistance in a series connection R = R1 + R2 + R3 + … + Rn Resistance in parallel 1 R 1 R1 1 R2 ... 1 Rn

Heating Effect of current Electric energy = VIt
Heat, H VIt I 2 Rt

Application Electric iron, toaster, fused wire Fused wire: a low-melting point wire connected in series with electric devices for safety. Electric power P VI I R
2

V2 R

Unit – 1 kWh = 3.6 × 106 J 1 W = 1V × 1A Definitions Potential difference: The potential difference between two separate points is defined as the work done to move a unit positive charge from one point to another.

Resistivity: Resistivity of a substance is equal to the resistance of a unit square of that substance. Law Ohm’ law: Under constant physical conditions (i.e., constant temperature, pressure etc.), the current flowing through a conductor is directly proportional to the potential difference across the conductor.

Contribute to this Revision Note: If you find anything of importance missing from this note, email it to us at revision-notes@meritnation.com, and we’ll add it to this note under your name!

...unit of a unit test charge transported between two points.
The electron volt is a unit of energy equal to approximately 1.6×10−19 joule (J). It is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt. Thus it is 1 volt (1 joule per coulomb, 1 J/C) multiplied by the electron charge (1e, or 1.602176565(35)×10−19 C).
Electric current is the flow of charge (i.e. the + of batteries is charged...

...Dalton Leach
Physics 2 lab chapter 21
6/26/2015
Procedure Part I Wire Resistance:
As wire length (cm) increases, the resistance (Ω) increases
As wire area (cm2) increases, the resistance (Ω) decreases
As wire resistivity (Ωcm) increases, the resistance (Ω) increases
Procedure Part II: Ohm’s Law: Electricity, Magnets, and Circuits Ohm’s Law
mA is milliamps, and 1000 milliamps equals one Ampere.
Move the potential (volts) and resistance (ohms) sliders and...

...Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point:
(a) on the surface,
g = GM / r2 = (6.67 × 10-11)(6.0 x 1024) / (6.4 x 106)2 = 9.77ms-2
(b) at height 0.50 times the radius of above the Earth's surface.
g = GM / r2 = (6.67 × 10-11)(6.0 x 1024) / ( (1.5 × 6.4 x 106)2 = 4.34ms-2
Example 2:
The acceleration due to gravity at the Earth's surface is 9.80ms-2. Calculate the...

...and so the particles collide more frequently. Good conductors have free electrons. Metals contain free electrons and so they are good conductors. Free electrons increase conductivity because they move faster and so collide with other particles more.
Note: Good conductors often feel hotter/colder than the surroundings however this is not the case. Actually, the material is just conducting the heat into/away from your hand faster.
Infrared Radiation
All objects continually...

...last email and also it did not make perfect sense for me to note. As far as I am concerned the khan academy does not lecture it so I am not too sure in what to do about this.
I am assuming finding velocity is the sole purpose of applying the law of conservation of momentum. Is this true?
I also would like to note that a graph could not be drawn in some situations again due to me lacking the technology to send photos of handwritten notes. Hence...

...Chapter10: Physical Characteristics of Gases
Section 10-1
The Kinetic-Molecular Theory of Matter
Prerequisites
The kinetic-molecular theory is based on the idea that particles of matter are always in motion. The theory can be used to explain the properties of solids, liquids, and gases in terms of the energy of particles and the forces that act between them.
ideal gas: an imaginary gas that perfectly fits all the assumption of the...

...Chapter10
The Open System Interconnection (OIS) reference model is a template and using a network and its resources.
Application Layer: Responsible fro interacting with end users.
Presentation Layer: Responsible for the coding of data.
Session Layer: Responsible for maintaining communication sessions between computers.
Transport Layer: Responsible for breaking data into packets and properly transmitting it over the network.
Network Layer: Responsible for the...

...the length and cross-sectional area of a sample, it can calculate its resistance.
* Resistivity is given the symbol ρ and is measured in Ohm Meters (Ωm, or Kgm3s-3A-2 in base units).
* For example, copper has a Resistivity of 1.68 ×10-8 Ωm, and Germanium 4.6 ×10-1 Ωm.
* The Resistance of a material of Resistivity ρ, length l and cross-sectional area A is calculated by the formula:
Bonding
* Compounds are formed when two or more atoms join...

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