Current and Ohms law.

Slides:



Advertisements
Similar presentations
Which type of circuit has more than one path for electricity to flow?
Advertisements

Lecture Ten Physics 100 Fall 2012  Series and Parallel Circuits.
Electric Circuits.
Electricity refers to the presence of electric current in wires, motors, light bulbs, and other devices. Electricity carries power. Power (P)
Electric Circuits and Power Page 706. Ohm’s Law Resistance is equal to the voltage divided by the current. Resistance = Voltage Current Ohms ( ) = Volts.
Electricity Foundations of Physics. Electricity The movement of charge from one place to another Requires energy to move the charge Also requires conductors.
Circuits & Electronics
Electrical Energy - Moving electrons in a path is electricity
+ Circuits. + Why can’t you use lightning to power electrical devices? Lightning releases large amount of electricity. Devices need CURRENT to flow.
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.
“Introduction to Circuits”
Electric Current and Ohms Law. Electric Current The continuous flow of electric charge –The two types of current are direct current (DC) and alternating.
Electrical Systems. VOCABULARYOBJECTIVES  Series circuit  Voltage drop  Kirchoff’s Voltage Law Describe a series circuit. Calculate the resistance.
describes the relationship between current, voltage, and resistance greater the voltage across a device with resistance, the greater the current through.
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?
Circuits Series vs Parallel. Electric Circuit Path of current flow As electrons move through a circuit, they transfer potential energy from the source.
Can you get the bulb to work? Each of you will get one bulb, one wire, and one battery. Your goal is to get the bulb to light. Easy right? When you find.
Current and Circuits Power and control all rolled into one fun filled adventure…not really.
Electrical Current and Circuits How Electricity Gets To Where It Is Going.
Electricity Sections 2 and 3. Electric Energy Cells/Batteries - Cell - device that produces an electrical current by converting chemical energy into electrical.
CELLS IN SERIES AND PARALLEL Lesson 9. Cells in Series  The electric potential given to a single electron by a dry cell has an average voltage of around.
Comes from Latin word that means, “to go around.” A circuit is a path provided to allow electrons to flow. A circuit allows the energy from a power.
+ Electric Circuits Series Circuits. + A Battery and a Bulb A flashlight consists of a reflector cap, a light bulb, batteries, and a barrel-shaped housing.
Warm-up How much power is dissipated by an electric heater connected to a 120V outlet when a current of 12 amps passes through it? What are electric components?
Determining Equivalent Resistance
ELECTRICAL CIRCUITS.
Ohm’s Law.
Ohms Law, current electricity, series circuits
Lesson No. 2 Science Grade 4
Electrical Circuits.
Aim: How is a Series Circuit different from a Parallel Circuit?
ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison.
Do Now: Why does current not come from a battery? Explain.
ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison.
Check your Understanding
Electric Circuits.
Ohm’s Law. Ohm’s Law Work, Energy, and Power Series Circuits.
Electricity.
Ch Electricity II. Electric Current (p ) Circuit
Electricity and Magnetism
Chapter 7 section 2 Electric Current
CHAPTER 1 ELECTRICITY.
Series and Parallel Circuits
Electric Circuits.
Electricity Chapter 17.4.
Parallel and Series Circuits
Series and Parallel Circuits
Series And Circuits.
Objective Students will be able to compare series and parallel circuits in order to describe how energy is transferred to produce light.
Circuits.
Series & Parallel Circuits
Circuits.
Electrical Current & Circuits
Electrical Current &Circuits
Electrons in Circuits. Electrons in Circuits Parts of a circuit Battery Closed switch (allows electrons to flow) Open switch (impedes flow) Wire Resistor.
Modified by Mr. Wanninkhof
Electricity Review.
Chapter Twenty One: Electrical Systems
Science 9 Electricity Review.
Electricity II. Electric Current Circuit Potential Difference Current
Electricity Review.
Voltage Difference The difference in electrical potential between two places. Unit of measure = V (volts) Voltage causes current to flow through an electric.
Relationships in Circuits
Electric Circuits.
Electric Circuits Chapter 35.
Basic Circuits.
Electric Circuits.
Electric Circuits Ch 17, section 4.
Electricity Chapter 17.4.
Electric Circuits Circuits control the movement of electric current by providing paths for electrons to follow. The path of an electric circuit is.
Presentation transcript:

Current and Ohms law

Why can’t you use lightning to power electrical devices? Lightning releases large amount of electricity. Devices need CURRENT to flow.

What is electric current? Continuous flow of electrons through a material Defined as the Amount of charge that passes through a wire in an amount of time Current is measured in amps More amps means more electricity flowing There are more charges (electrons) flowing in the wire

Does electric current automatically exist in a material? NO WAY!!! What does it need? A specific and completed path to flow or follow

To produce electric current… Charges must flow from one place to another Charges must flow from one place to another through a circuit A circuit has a power source(voltage), a pathway(conductor), and a load(resistance.) wire Electrons travel from the _____________ end of the battery all the way back around to the ___________ side of the battery.

Closed versus Open Closed path is working. no breaks in the pathway Open path does not work. Open places in the pathway Electrons travel from the Negative end of the battery all the way back around to the Positive side of the battery.

Can you build a simple circuit to light a bulb? Energy Source(voltage) Makes charges move around or flow in a circuit Resistor/Load Transforms electrical energy into something (like light

What happens if we add another bulb? Series Circuit- All parts are connected in a single loop. A series circuit provides only one path for charges to flow. Adding another load increases the resistance in the current. So the flow decreases, the current has decreased/dropped so the bulbs are not as bright. Ohms law states that as resistance increases and voltage stays the same, then the current will decrease.

What happens if we add another battery? Adding another battery increases the voltage in the current. So the flow increases, the current has increased so the bulbs are brighter. Ohms law states that as voltage increases and resistance stays the same, then the total current will increase. 3 volts