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.

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...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...

...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...

...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...

...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?
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...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
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...* Electric charge exists as discrete “packets”
* Q=NE where N is the some integer, e is the charge of an electron
* The charge of a single electron e is e=1.602x10^-19C, where the Coulomb (C) is the unit of charge
* Eg: determine 10 electrons= 10 x 1.602.10^19
Outline 4 properties of electric charge:
* unlike charges attract
* like charges repel
* charge is conserved
* charge is quantized.
Coulombs Law
Coulomb’s law is...

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Thermal Physics
Thermal Concepts:
Temperature (T) is a measure of how hot or cold an object is, and it is the temperature that determines the determines the direction of thermal energy transfer between two objects. It is a scalar quantity and is measure in...

...1
Class X Mathematics Chapter 2: Polynomials ChapterNotes Top Definitions 1. A polynomial p(x) in one variable x is an algebraic expression in x of the form p(x) = anxn an1xn1 an 2 xn 2 ........ a2 x2 a1x a0 , where (i) a0 , a1, a2......an are constants (ii)x is a variable (iii) a0 , a1, a2......an are respectively the coefficients of xi. (iv) Each of anxn an1xn1, an 2 xn 2 ,........a2 x 2 , a1x, a0 , with an 0,...

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