I amperes e volts kw kilowatts kva kilo voltamperes hp horsepower %. The handbook contains a wide array of topics and each topic is written by an authority on the subject. Current electricity formula sheet electrical resistivity and. Power is the rate at which energy is being used or that work is being done. This lesson can be used as part of a unit on electricity.
The handbook of electric power calculationsprovides detailed stepbystep calculation procedures commonly encountered in electrical engineering. Electrical formulas tm electrical formulas to obtain. Voltage current resistance and electric power general basic. If we know the power in watts of an appliance and how many seconds it is used we can calculate the number of joules of electrical energy which have been converted to sortie other form. Use the chart in this calculation guide to find the formula you need according to. If we connect them in series, r eq 300 if we connect them in parallel, r eq 30. Current i current is the quantity of electrons passing a given point.
Cbse class 12 physics chapter 3 current electricity formula. Formulae for calculating amperes, horsepower, kilowatts. Hundreds of electrical products and tools to select from. Common electrical units used in formulas and equations are.
V s supplied voltage or total voltage across impedance network. Electricity class 10 physics chapter complete with formulae 1. Read online and download pdf ebook electrical engineering formulas smps. Power watts, current amperage, resistance, voltage. Volt unit of electrical potential or motive force potential is required to send one ampere of current through one ohm of resistance. Chart on left shows the formulas used to calculate electricity. The units and formula for various electrical parameters included in. Basic electrical power fundamentals load reference kilowatts kilovolt amps power factor pf motors kw kva use nec 430148 kw pdf download glide to success with doorsteptutor material for ias. These are the three basic building blocks required to manipulate and utilize electricity. F n x i 2 x magnetic constant x a 2 x g 2 g length of the gap between the solenoid and a piece of metal, n number of turns, magnetic constant 4 x pi x 10 7. Legend single phase ac three phase ac kilowatts v volts, i amperes, pf power factor vxixpf 1.
Important notes of physics for neet, jee for current electricity are useful for all aspirants preparing for entrance exams including jee, neet. In this article, we will discuss this important concept of an electrical circuit and electric current formula with examples. Before moving to physics formula pdf sheet of chapter current electricity complete the theory form your text book than read the physics formula sheet of entrancei for effective revision do practice the questions from entrancei physics sections of chapter current electricity. I is the current in amps and is the count of electrons passing a particular point per second. Energy cheat sheet power is a term related to energy.
Electricity basics when beginning to explore the world of electricity and electronics, it is vital to start by understanding the basics of voltage, current, and resistance. Gcse physics which equations are used for electricity. Electric power calculator calculation general basic electrical formulas mathematical voltage electrical equation formula for power calculating energy work power watts calculator equation power law current charge resistance converter ohms law and power law power formulae formulas understandimg general electrical pie chart two different equations to calculate power electricas ohms law audio. Two resistors in parallel n equal resistors in parallel. In series combination, the current remains the same through the resistance network. Define and apply the concept of temperature coefficient of resistance. Ampere units of current one ampere is the current which one volt can send. To explain this we say that there are two types of electric charge, called positiveandnegative. All this formulas are useful for basic calculation in electrical engineering including voltage,ampere,power, efficiency,power factor and many more. We can find the following quantities by using below formulas chart electrical formulas in dc full load current in amperes alternating current ac motors alternating current ac single. Electrical charts, tables and formulas minimum size grounding conductors for grounding raceways and equipment from nec table 250122 rating or setting of automatic overcurrent device in circuit ahead of equipment, conduit, etc. This is a complete set of notes of current electricity which is a part of physics syllabus for neet, jee. The current density, which we have defined as the current thr ough unit ar ea nor mal to the curr ent is also dir ected along e, and is also a.
To determine the current, use the following formula. Electric current is nothing but the rate of change of electric charge through a circuit. Electric current formula definition, equations, examples toppr. All electrical engineering formulas advanced design technology, ltd. An electrical distributor supplying everything from light bulbs and dimmers to plcs and industrial automation equipment. Electrical formulae for current, voltage, resistance, power and conductivity. Formula booklet physics class 12 chapter current electricity.
Formula booklet physics class 12 chapter current electricity entrancei. Figure 216 resistors in series a three resistors, r 1, r 2. One ampere is 6,280,000,000,000,000,000 electrons passing a point in one second. The symbol font is used for some notation and formulae. Electric current relates the electric charge and the time. Voltage current resistance and electric power general. In order to construct a building that will last into the future, a strong foundation is a prerequisite.
Amount of energy transferred between two points in an electrical circuit in other words. Finding motor hp horse power, kva kilovolt ampere kw input, when motor hp is known kw kilowatts amperes, when kva is known. If the greek symbols for alpha beta delta do not appear here a b d the symbol font needs to be installed for correct display of notation and formulae c e e g i i k l m n p. Electric power calculator calculation general basic electrical formulas mathematical voltage electrical equation formula for power calculating energy work power. Formula for current in the workplace another example of a simple dc. Electricity is the flow of electrons around a closed circuit it was discovered by william gilbert it consists of electrons in motion 3. This current is related to the voltage and resistance of a circuit. If physical conditions of a conductor such as temperature remains unchanged, then the electric current. Electrical current flows from a region of high charge or potential to a region of low potential.
In this constructivist activity, students will find one new fact about electricity and write a. Important notes are also helpful for revision when you have less time and have to study many topics. Here i discuss some of important electrical formulas. E voltage volts i r or current amps resistance ohms figure 10. Example 1 determine the current flowing through the electric heater have p. Scribd is the worlds largest social reading and publishing site.
Ohm unit of resistance one ohm is the resistance offered to the passage of one ampere when impelled by one volt. These physics formula sheet for chapter current electricity is useful. The treatment throughout the handbook is practical with very little emphasis on theory. Download electrical engineering formulas smps pdf file for free, get many pdf ebooks from our online library related with electrical engineering formulas smps. It is the amount of energy available or used over a given time e. Useful electrical formulas to obtain single phase three phase kilowatts v x i x pf 1. Engineers mininotebook formulas, tables and basic circuits. Pradeep kshetrapal current electricity genius physics. Where v is the voltage in volts and it measures the difference the electrical energy between 2 points on a circuit. R is the resistance in ohms and controls the flow of electric current. Thecombattractsthehairandviceversa,butthe hairs repel each other, and two combs similarly charged will likewise repel each other. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second. At first, these concepts can be difficult to understand because we cannot see them.
Pradeep kshetrapal current electricity 3 formulas in current electricity direct current 1 electric current iqt q is charge passing in normal direction through a cross section of conductor in time t 2 drift velocity v d with electric field v d e is charge and m is mass on electron, e. Electricity class 10 physics chapter complete with formulae. The equations that are used for electricity click on an equation below for more information the two most important equations in electricity are given below p v x i power voltage x current v i x r voltage current x resistance other equations that you should know include. Suppose you have a electrical field, the voltage is equal to. Problem set 3 electric current and direct current circuits part a. Fundamentals of electricity using the simple circuit shown, assume that the voltage supplied is 12 volts, and the resistor provides six ohms of resistance. Below is a reference chart giving all the equations deriving from ohms law. Current strength, in a conductor, is defined as the rate of flow of charge across any cross section of the conductor. It is only applicable when the resistance network is connected in a parallel combination. The parameters e, i, r and p are shown in the central area, each occupying one of the four quadrants of the pie. Electric current i is the rate of the flow of charge q.
This is typically a lot of joules so we pay for electricity in large units that are called kilowatthours kwh power x time energy. Directcurrent circuits chapter 21 electric current and. Alternating current alternating or to find singlephase threephase to find direct current amperes when hp x 746 hp x 746 amperes when voltage and e. Electricity formulas are applied in calculating the unknown electrical parameters from the known in electric circuits solved examples. The unit for power is the watt w and power can be calculated from the following. Electricity basics electrical charge voltage current resistance ohms law an ohms law experiment resources and going further electricity basics when beginning to explore the world of electricity and electronics, it is vital to start by understanding the basics of voltage, current, and resistance. Current electricity formula sheet electrical resistivity. I hope it can make your basic understanding about electrical calculation is clear. What you may not have noticed is that static electricity can result in both attractiveandrepulsiveforces. Prepare the current electricity chapter by using new and important formulae. Current electricity formula sheet free download as pdf file. An overcurrent device circuit breaker or fuse must be sized no less than 125 percent.
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