Electric Current. In this session we will, Review how we measure electric charge Discuss voltage and electric current Look at electric current in batteries.

Slides:



Advertisements
Similar presentations
Internal Resistance.
Advertisements

Cells have positive and negative electrodes.
Science 9 Electricity Review Ohm’s Law Circuits.
What is Electricity? Electricity is the flow of moving electrons. When the electrons flow it is called an electrical current.
Bell Ringer R30 What do you think a circuit looks like if you would draw a picture? Include in picture: battery, wires, and a lightbulb.
Electricity refers to the presence of electric current in wires, motors, light bulbs, and other devices. Electricity carries power. Power (P)
Topic 2 Electricity Within a Circuit. Static and Current Electricity: When charged particles build up in an object it is called static electricity. Another.
Energy Review. The unit for kinetic energy. Joule.
Ohm’s Law The most important fundamental law in electronics is Ohm’s law, which relates voltage, current, and resistance. Georg Simon Ohm ( ) studied.
Electric Current. Answer Me!!!  Why are electric wires made from metal?
Current Electricity.
Circuits Electric Circuit: a closed path along which charged particles move Electric Current: the rate at which a charge passes a given point in a circuit.
Arsenie, May 2015 Electrostatics. Electrostatics, or electricity at rest, involves electric charges, the forces between them, and their behavior in materials.
Lab 2: Ohm’s Law Only 10 more labs to go!!
Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?
Current Electricity. Current A measure of the flow of charge. Ampere: Electrical measurement of the flow of electrons. 1 Ampere = 1 Coulomb/second. 1.
Electric Current Electrical current is the flow of electrons. Unlike static electricity, charges are in motion. Two types of Current I. Direct current.
Electrical Potential (Voltage) Answers (Page 303)
Ch. 34 Electric Current.
Current Electricity. Why did the electron cross the road? Or, why do electrons move in the wire when terminals are connected?
Electrical Current Mr. Fleming.
Part II: Electrochemistry Electricity is generated by the movement of charged particles, in which opposite charges ___________ one another and like charges.
 Electricity is caused by the flow (or net movement) of Electrons  Electric Current – the rate that positive charges flow in a circuit › Actually a.
CURRENT ELECTRICITY Characteristics of Current Electricity.
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
Chapter 7 Electricity. What is Charge? Protons have a (+) charge Electrons have a (-) charge Charge (q) is measured in Coulombs The elementary charge.
Calculating Electricity
Kashif Bashir1 mailto: Web: kashifpaf.greatnow.comkashifpaf.greatnow.com OHM’s LAW.
Circuits with more than one resistor, then Watt happens? Series and Parallel are the 2 ways of connecting multiple resistors.
Electric Circuits. Potential Electric Potential is just like gravitational potential It depends on –The distance from the source –The amount of charge.
Electric Circuits. Electric Circuit Is a closed path for the flow of electrons. Consists of: 1.Source of electricity 2.Wires to conduct the flow of.
1 Chapter 20 Review activity! Fun in B208!.  A. Unit of energy  B. Unit of charge  C. Unit of current  D. Unit of voltage. 2 What is a coulomb?
Electricity It’s Shocking!!. Current Electricity Current Electricity is a constant flow of electrons through a circuit. There are three main parts to.
Circuit Electricity May 30, 2012 Chapter 22. Terms  Current: Flow of charge  Symbolized by “ I ”  Units = Coulombs/second = Amperes (A)  Circuit:
2c) Energy and Potential Difference in Circuits Part 1 Current and Charge.
ELECTRICI TY PART 2, VOLTAGE AND CURRENT VOLTAGE AND CURRENT  Electric charges have ELECTRICAL POTENTIAL ENERGY Depends where they are in the electric.
Objective: S Define voltage (electric potential difference) as the energy per unit charge between two points along a conductor and solve related.
Electrical Current and Circuits How Electricity Gets To Where It Is Going.
5.2.2 D.C. Circuits Practical circuits Electromotive force and internal resistance Kirchhoff’s laws Series and parallel arrangements Potential divider.
Methods of Charging Conduction – A Charged Object comes in CONtact with a neutral object. – The neutral object takes on the same Net Charge as the Charged.
Electricity and Circuit. Types of Electricity Static Electricity – no motion of free charges Current Electricity – motion of free charges – Direct Current.
Measuring Electricity. Electric Potential – the electrical energy that an electron possesses. Electric current is a measure of the rate at which the electric.
Physics 12 Mr. Jean April 3th, The plan: Video clip of the day Review Assignment Questions Volts Ohm’s Law Current.
Rank the substances in order of their index of refraction Substance A Substance B Substance C Substance A Substance D Substance E Substance B.
Current Electricity.
Reformatted for Powerpoint by Megan Maller
WARM UP Draw a picture of a SERIES Circuit. Show a battery, a switch, and a light bulb in your drawing. Draw a picture of a PARALLEL Circuit. Show a battery,
Ohm’s Law.
Electricity and Circuit
Voltage, Current, and Resistance
Bell Ringer: Define to the best of your ability the definition of:
Do Now: Why does current not come from a battery? Explain.
Check your Understanding
Why Make Electrons Flow Anyway?
ELECTRICAL CIRCUIT BOARDS
Topic H: Electrical circuits
Electromotive Force and Current
Basic Electrical Calculations
Electrical Current & Circuits
Modified by Mr. Wanninkhof
Electricity (Lesson 2).
Ohm’s Law and Circuit Basics
But what was this “electricity”?
Science 9 Electricity Review.
Current, Volts and Resistance (Ohm’s Law)
Please bring your book tomorrow.
Ohm’s Law
Ohm’s Law & Circuits Chapter 7.2 & 7.3.
Voltage Difference The difference in electrical potential between two places. Unit of measure = V (volts) Voltage causes current to flow through an electric.
Announcement Ohm’s law video is due at midnight Makeup lab today
Presentation transcript:

Electric Current

In this session we will, Review how we measure electric charge Discuss voltage and electric current Look at electric current in batteries Review Ohm’s Law

Before we begin, let’s discuss.... How do materials develop electric charge? Under what conditions does electric charge flow?

Coulombs Coulomb = standard unit of electric charge In other words, the amount of electric charge possessed by an object is measured in coulombs. One coulomb = 6 billion billion electrons, or about the amount of charge that flows through a 12-watt light bulb. –Shows you how tiny electrons are

Coulomb’s Law

Volts Voltage exists when there is an imbalance in charge If two objects have different amount of charge, there is voltage between them For example, standard battery has a voltage difference of 1.5 volts between its positive and negative terminals Volts expressed in joules/coulomb

Review To This Point In a 12-volt car battery, every coulomb of charge that moves from one side to the other does ________ joules of work.

Ohm’s Law Electric current is driven by ________. Electric current is measured in ______, which is dependent on _______ and ______. Electrical resistance is measured in ______. Ohm’s Law: I = V/R, where I is amperes, V is voltage, and R is resistance

Ohm’s Law Triangle To calculate voltage, V: put your finger over V, this leaves you with I R, so the equation is V = I × R To calculate current, I: put your finger over I, this leaves you with V over R, so the equation is I = V / R To calculate resistance, R: put your finger over R, this leaves you with V over I, so the equation is R = V / I

Ohm’s Law Practice 1) 3 volts is applied over a 6 ohm resistor. What is the current in amperes? 2) A lamp connected to a 6 volt battery passes a current of 0.06 amperes. What is the lamp’s resistance? 3) A 1200 ohm resistor passes a current of 0.2 amperes. What is the voltage?

Questions?