Fig 1 shows a simple rc circuit that employs a dc voltage. Example problems problem 1 a when a potential difference of 12 v is applied to a wire of radius 0. Tippens, professor of physics southern polytechnic state university a powerpoint presentation by. Any switch in your house that controls a single bulb is a series circuit. Junction rule sum of currents entering any junction must equal the sum of the currents leaving that junction. Equivalent to advanced placement if this is too advanced for you, you can try the more basic version here. All the circuit components are in line, connected by the conductor, so that all the. In this topic youll learn about the physics behind the electronic devices we use. If you have a dimmer switch, the dimmer is in series with the bulb kinda like a variable resistor and reduces the voltagecurrentbrig. Jan 19, 2020 this topic covers dc circuits of a level physics.
Introduction to circuits and dc instruments physics. Free practice questions for ap physics 2 understanding dc circuit diagrams. Meters in circuits current is measured with an ammeter an ammeter is wired in series with the circuit element or section of the circuit being examined. They facilitate students ability to a track the change in electric potential difference and current around a circuit, b combine potential difference. Circuits make computers, digital cameras, and video games possible. The sum of the currents flowing into any junction is equal to the sum of the currents flowing out. Resistors in series and parallel resistors in series. Capacitance, resistance, dc circuits 20, richard white. When the circuit is purely resistive, everything in this module applies to both dc and ac. Detailed background for electrical fields is covered in introductory physics courses phys 2524 at ou so. In fact, ac and dc motor designs are very similar to their.
If you plug something in the wall it runs on ac although some devices internally convert the ac. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. Directcurrent circuits department of physics and astronomy. Physics 126 laboratory manual 37 experiment 7 dc circuits and instruments look for knowledge not in books but in things themselves. In particular, if a coil rotates in the presence of a magnetic field, the induced emf varies sinusoidally with time and leads to an alternating current ac, and provides a source of ac. Resistance decreases and current increases as resistors are added in parallel to a source of constant voltage. Understanding dc circuits covers the first half of a basic electronic circuits theory course, integrating theory and laboratory practice into a single text. Online content can be accessed through a comprehensive table of contents, search engine, and numerous curriculum groups. Of course there is danger of electrical shock when directly performing manual work on an. For general help, questions, and suggestions, try our dedicated support forums. Introduction to circuits and dc instruments college physics. The manual contains sufficient exercises for a typical 15 week course using a two to three hour practicum period.
This is the post on the topic of the bsc physics dc circuits notes pdf download. Principles with applications 7th edition answers to chapter 19 dc circuits questions page 549 1 including work step by step written by community. A simple dc circuit is given in below figure to make the reader get aware of dc circuit components and its parameters. Dc circuits may be in series, parallel or some complex combination. While dc motors require the use of brushes to make electrical contact with moving coils of wire, ac motors do not. Introduction to dc circuits electric voltage and current. Circuit theory i superposition the superposition principle states that the voltage across or current through an element in a linear circuit is the algebraic sum of the voltages across or currents. Build circuits with batteries, resistors, light bulbs, fuses, and switches. Inductors will store energy in the form of a magnetic field. What are some examples of series circuits in daily life. In adddition to joules, watthour can also be used to measure energy.
In circuits with elements that store energy, it is common for current and voltage to exhibit exponential increase and decay figure 6. This site is for the storage and showcase of work done by mr. Direct current dc electrical circuits by ron kurtus. Lecture 7, slide 2 even if only fractions of a second. What is the current through, voltage across and power dissipated by the 300. Finally, a number of important dc instruments, such as meters that measure voltage and.
It involves the logical application of rules and problem solving more complex circuits. Dc circuits are simply those in which the current moves in one direction only thus direct current dc. This makes it easier to refer to voltages, since you can generally assume that the 2nd point is ground if. Module 6 dc motors this module describes the types of dc motors and includes discussions of speed control, applications, and load characteristics. Several key features in each unit make this an excellent teaching tool. The goal of these experiments is for the student to develop an understanding of direct current circuits consisting of batteries and resistors or other resistances. Pdf understanding dc circuits download read online free. Phy 124 dc circuits stony brook physics laboratory manuals. However, strong involuntary reactions to shocks in this range may lead to injuries. Directcurrent circuits chapter 21 electric current and. Phy2044 notes from florida atlantic university calculusbased electric current and dc circuits. Physics 202, lecture 20 todays topics ac circuits with ac source resistors, capacitors and inductors in ac circuit rlc series in ac circuit impedance resonances in series rlc circuit ac circuit.
Others, such as those used in supercomputers, are extremely complex. It is very important that you become familiar with the symbols that are. This article is concerned with the analysis of simple direct current circuits of two types. We do consider what happens when capacitors are connected to dc voltage sources, but the interaction of capacitors and other nonresistive devices with ac is left for a later chapter. Resistors in circuits summary the physics hypertextbook. Physicslab, online high school physics pogram and advanced placement physics program, started in 1997. It is a very good practice to never touch live circuit elements. Calculate total resistance of a circuit that contains a mixture of resistors. The history of electricity starts more than two thousand years ago, with the greek philosopher thales being the earliest known researcher into electricity. Artificial intelligence 205 how circuits work johan dc kleer xerox parc, intelligent systems laboratory. Equipment dc power supply dcps, voltmeters, resistors, resistor boxes and variable resistors. Compare and contrast series, parallel and combination circuits.
The capacitor is an electrical component that houses electric charge. Volume 3 of 4 module 7 basic ac theory this module describes the basic concepts of alternating current ac electrical circuits and discusses the associated terminology. Understanding dc circuit diagrams example question. This collection of modules takes the topic of electric circuits a step beyond simple circuits. Circuits containing inductors will behave differently from a simple resistance circuit. Electrochemistry combining chemicals with certain metals causes a. Dc circuits mcqs with explanatory answers electrical.
Phy2049 notes from florida atlantic university calculusbased. Do all this without the fear of being electrocuted as long as you dont use your computing device in the bath tub. The superposition principle states that the voltage across or current through an element in a linear circuit is the algebraic sum of the voltages across or currents through that element due to each independent source acting alone. Our main goal in solving a dccircuit problem is to find the current that flows in every branch of the circuit. Module 1 covers the basics for circuits that include dc sources voltage or current. Measurements on dc circuits 1 objectives the objective of this experiment is to analyze simple resistive circuits in dc. This laboratory manual is intended for use in a dc electrical circuits course and is appropriate for two and four year electrical engineering technology curriculums. A dc circuit has current flowing in only one direction and is usually powered by a battery. Chapter 26 dc circuits young and freedman univ physics 12th ed. This law states that the current in a circuit is directly proportional to the potential. Power, which is defined as the rate at which work is done or energy is used, is measured in watts 1 watt 1 jsec. Total power in a circuit at any instant is must be zero. Ap physics electric circuits, dc circuits are classified by the type of path that the electricity follows as it goes around the circuit. Ac circuits 3 solving for the current and using eq.
In this unit, youll learn about the physics behind the electronic devices we use. Dc circuit basics 2 ground ground is the name given to the v0 reference point. The dc source allows the electricity or current to flow with an unvarying polarity that doesnt change with time. Add resistors, light bulbs, wires and ammeters to build a circuit, explore ohms law. The basic dc circuit is the easiest to understand, so the chapter begins with the basic circuit and from there works into the basic schematic diagram of that circuit. Science 14 lab 3 dc circuits theory all dc circuit analysis the determining of currents, voltages and resistances throughout a circuit can be done with the use of three rules. The schematic diagram is used in all your future work in electricity and electronics. Physics 231 lecture 625 fall 2008 rc circuits up until now we have assumed that the emfs and resistances are constant in time so that all potentials, currents, and powers are constant in time however, whenever we have a capacitor that is being charged or discharged this is not the case now consider a circuit that consists of a source of emf, a. Even though module 1 is not very difficult, it forms the foundation for more complicated topics in modules 2 and 3 so it is important to have a firm grasp of all module 1 topics before moving on.
Fundamentals of direct current circuits ced engineering. We will also use it to represent the implied completion of a circuit, even when we. Dc electrical circuits consist of a source of dc electricity with a conducting wire going from one of the terminals to a set of electrical devices and then back to the other terminal, in a complete circuit. William gilbert 15441603 objectives to learn the use of several types of electrical measuring instruments in dc circuits. Dc circuits open textbook library center for open education. This makes it easier to refer to voltages, since you can generally assume that the 2nd point is ground if it is not explicitly stated. Dc circuits watch the following physics concept trailer to see the important role that circuits play in operating electric cars.
In this atom, we will study how a series rc circuit behaves when connected to a dc voltage source. Directcurrent circuits utk department of physics and. Most students of electricity begin their study with what is known as direct current dc, which is electricity. Circuits are driving an unprecedented rate of change in how we live. Chapter 27 questions 1, 3, 5 chapter 27 problems 7, 19, 49. In subsequent atoms, we will study its ac behavior. Electricity notes gcse physics this means that if you want a current to flow you must put a battery in the circuit.
Rc circuits circuits that have both resistors and capacitors. Abstract this paper presents a theory of corn monsense understanding of the behavior of electronic circuits. An rc circuit is one containing a resistor r and a capacitor c. If youre having any problems, or would like to give some feedback, wed love to hear from you. Besides gaining a good feel for the fundamental concepts of circuitscurrent and potential differencethe other goal of todays lab is to become comfortable and good at. Physics 251 dc circuits lab 1 fall 2002 physics 251 laboratory dc circuits i. There are two types of circuits series circuits and parallel circuits. Series and parallel connections will be explored as well as the resistance properties of.
For more content related to this post you can click on labels link. I direct current dc modern life could not exist if it were not for electricity and electronics. Figure 6 dc current through an inductor es03 page 4 rev. Physics 231 lecture 62 fall 2008 resistors in series and parallel as with capacitors, resistors are often in series and parallel configurations in circuits series parallel the question then is what is the equivalent resistance. Electrical circuits often contain one or more resistors grouped together and attached to an energy source, such as a battery. View the circuit as a schematic diagram, or switch to a lifelike view.
General physics ii notes from etsu calculusbased current and resistance. Equivalent to american high school diploma if this is too basic for you, you can try the more advanced version here. Module 1 covers the basics for circuits that include dc sources voltage or current and resistors. The post is tagged and categorized under in bsc physics, education news tags. Tippens, professor of physics southern polytechnic state university. This book covers direct current dc circuit theory and is broken up into three modules.