3 These shocks are a result of static electricity!!! Unit 5: Electricity. Static Electricity.Have you ever reached out to open a door and received a shock from the knob?These shocks are a result of static electricity!!!
4 Unit 5: Electricity. Static Electricity. Electricity is a form of energy that involves the movement of electrons from one point to another
5 Unit 5: Electricity. Static Electricity. To understand electrical charge… Let’s think back.Protons (+) and electrons (-) are chargedObjects can become charged when atoms in the objects gain or lose electrons.
6 An atom that loses an electron becomes positively charged. Unit 5: Electricity. Static Electricity.An atom that loses an electron becomes positively charged.
7 Unit 5: Electricity. Static Electricity. A charged object exerts a force – a push or a pull There are two types of charges – negative and positive
8 The Law of Electric Charges states… Unit 5: Electricity. Static Electricity.The Law of Electric Charges states…
9 We can charge objects THREE ways: Unit 5: Electricity. Static Electricity.We can charge objects THREE ways:Friction:Rubbing two objects together can cause electrons to be “wiped” from one object and transferred to the other.
11 Unit 5: Electricity. Static Electricity. 2. ConductionTransfer of electrons from one object to another THROUGH direct contactTouching a negatively charged plastic ruler to an uncharged metal rod causes electrons from the ruler to travel to the rod. The rod becomes negatively charged by conduction.
12 Unit 5: Electricity. Static Electricity. 3. Induction:Occurs when charges in an uncharged object are rearranged WITHOUT direct contact with the charged objectA negatively charged balloon induces a positive charge on a small section of a wall because the electrons in the wall are repelled and move away from the balloon
13 Static Electricity: the build up of electrical charges on an object. Unit 5: Electricity. Static Electricity.Static Electricity: the build up of electrical charges on an object.Static means "not moving" so the objects don’t move away from each other, they remain charged.LabBean
14 So how does lightening form?! Unit 5: Electricity. Static Electricity.So how does lightening form?!During a thunderstorm, water droplets and air move within the storm cloud. As a result, (-) charges build up at the bottom of the cloud and (+) charges at the topBecause different parts of clouds have different charges, lightening can also occur within and between clouds.The (-) charge at the bottom of the cloud induces a positive charge on the ground. The large charge difference causes a rapid movement of (-) called lightening
18 What is static electricity? Bell RingerWhat is the difference between conduction and induction? Provide examples.What is static electricity?
19 Unit 5: Electricity. Circuits. Electricity Lesson 2
20 Unit 5: Electricity. Circuits. Have you ever noticed that the cords coming out of the wall are made with plastic AND metal?
21 ELECTRONS FLOW MORE EASILY Unit 5: Electricity. Circuits.Conductors are materials that allow charges to flow easily throughoutE.g. MetalsSemi-Conductors are materials that conduct electric current better than an insulator but not as well as a conductorE.g. SiliconELECTRONS FLOW MORE EASILYInsulators are materials that DO NOT allow charges to flow easily throughoutE.g. Wood, glass, or plastics
23 How many ways can you light the light bulb? Unit 5: Electricity. Circuits.How many ways can you light the light bulb?
24 Did you create a circuit? Unit 5: Electricity. Circuits.Did you create a circuit?A circuit is a complete, closed path for an electric current to flowAll circuits consist of an energy source, a load, and wires to connect the parts together.
25 Unit 5: Electricity. Circuits. Electrons travel from thenegative positiveterminal of the battery.
26 Unit 5: Electricity. Circuits. Series Circuit: circuit where all parts are connected in a single loop –only one possible path for charges to flow
27 Unit 5: Electricity. Circuits. Parallel Circuit: A circuit in which different loads are on separate branches – charges can flow in more than one route
28 Unit 5: Electricity. Circuits. Circuit Board: a collection of hundreds of tiny circuits that supply electrical current to various parts of electronic devices
29 Unit 5: Electricity. Circuits. Transistor: part of an electronic device that can be used as an amplifier or a switch
30 Unit 5: Electricity. Circuits. Diodes: part of an electronic device that only allows electric current to go in one direction
31 Unit 5: Electricity. Circuits. Integrated Circuit Board: an entire circuit containing many transistors and other electronic components formed on a single chip
33 Unit 5: Electricity. Resistance. TermUnitMeaningCurrent (I)Amperes (A)The rate at which a charge passes a given pointVoltage (V)Volts (V)The difference in energy between 2 points in a circuit(potential difference)Resistance (R)Ohms (Ω)Anything that opposes the flow of electric change(act like friction)Anything in a circuit can act as a resistor
34 Unit 5: Electricity. Resistance. A German school teacher named Georg Ohm found the relationship between current (I), voltage (V), and resistance (R)Ohm’s Law
36 Unit 5: Electricity. Resistance. What is a resistor?A resistor restricts the flow of electric current.
37 Four Factors that affect resistance Unit 5: Electricity. Resistance.Four Factors that affect resistance
38 Unit 5: Electricity. Resistance. 1. The material itselfGood conductors have low resistance.Insulators have high resistance.
39 2. The thickness of the wire Unit 5: Electricity. Resistance.2. The thickness of the wireTHICKER WIRE = Less ResistanceANALOGYThink of the wire like a hallway:If the hall is very wide, it will allow a high current through it, while a narrow hall would be difficult to get through.
40 THE LONGER THE PATH = the more resistance encountered Unit 5: Electricity. Resistance.3. The length of the wireTHE LONGER THE PATH = the more resistance encountered
41 HIGHER TEMPERATURE = MORE resistance Unit 5: Electricity. Resistance.4. TemperatureAs the conductor (hallway) heats up, the protons start vibrating faster. They are more likely to get in the way and make it harder for the electrons to flow. HIGHER TEMPERATURE = MORE resistance
44 Magnets: any material that attracts iron or materials containing iron Unit 5: Electricity. Electromagnets.Magnets: any material that attracts iron or materials containing ironNickel and Colbalt
45 Unit 5: Electricity. Electromagnets. Magnetic Force: forces of repulsion or attraction between the poles of magnets
46 Unit 5: Electricity. Electromagnets. Electromagnet: A magnet that consists of a solenoid wrapped around an iron coreSolenoid:A coil of wire that produces a magnetic field when carrying an electric current
47 Electricity & Magnetism Unit 5: Electricity. Review.Electricity & MagnetismReview Day
48 Warm Up (In your journals) Unit 5: Electricity. Review.Warm Up (In your journals)1. Please identify the following as an electric motor or generator:Power drillElectric FanHand cranked flashlightWashing machine2. Please explain how electromagnetic induction and generators are related.
49 Electromagnetic Induction Unit 5: Electricity. Review.Electromagnetic InductionProcess by which an electric current is produced by a changing magnetic fieldExamples:-generators