Presentation on theme: "Unit: Electricity Monday, Feb 3, 2014 Objective: SWBAT describe the basic concepts needed for electricity understanding. BR- 1. What is a volt? 2. Describe."— Presentation transcript:
Unit: Electricity Monday, Feb 3, 2014 Objective: SWBAT describe the basic concepts needed for electricity understanding. BR- 1. What is a volt? 2. Describe the energy conversions you think take place in a nuclear power plant LESSON- 1. Notes vocab HW- finish wksht
The origin, motion, and energy of electrons in circuits; The role of batteries as energy sources and resistors as energy dissipaters in circuits; Conceptual understanding of potential difference (i.e., voltage); Current and resistance and the relationship between them.
A particle with a positive charge is called a/an _______________. proton electron neutron
A particle with a negative charge is called a/an _______________. proton electron neutron
_________ means to push away. _________ means to pull together. charge attract repel charge attract repel
If an electrically-neutral object GAINS electrons, what charge does it now have? positive negative neutral
If an electrically-neutral object LOSES electrons, what charge does it now have? positive negative neutral
In Chemistry, you already learned about the interaction of charges. Objects with opposite charges (one negative, one positive) will attract each other. Objects with like charges (both negative or both positive) will repel each other.
Let’s start with some vocab… Electricity Circuit Current
Let’s start with some vocab… Electricity- a form of energy resulting from charged particles. Circuit- a closed loop that electrons can flow through Current-a measure of the flow of electrons (how many electrons pass a point per second) (measured in Amps)
What is the difference between open and closed circuits?
Click on a term to reveal its definition. circuit open circuit closed circuit Proceed to quiz
Circuit: A closed-loop path of conduction through which an electric current flows
Open circuit: An incomplete path that will not permit an electric current to flow
Closed circuit: A complete path for electric current
Quiz: What type of circuit is shown in each of the following examples? Open circuit Closed circuit
Types of energy sources: Battery: -Has two TERMINALS: -One positively charged & one negatively charged -Chemical reaction occurs in the battery that separates the charges to the positive and negative sides
Electric Potential Energy -This separation of charges (from the chemical reaction) causes a build up of potential energy. -Electrons flow from an area of high PE to low PE. -Just like gravitational potential energy… -Video: http://www.youtube.com/ watch?v=Aq31mjWYdJ8 http://www.youtube.com/ watch?v=Aq31mjWYdJ8
Battery cont -When a circuit is created, electrons flow from the negative end to the positive end -electrons are repulsed by the negative side and attracted to the positive side
-A chemical reaction inside a battery causes a separation of charges -This separation of charges causes a build up of potential energy. -Electrons flow from an area of high PE to low PE. -Just like gravitational potential energy… (recall video) Review from yesterday…
Potential Difference (voltage) Voltage is the measure of potential energy supplied to each coulomb of charge Units- volts (V) Is dependent on the energy source NOT the circuit! the more volts a source has, the more potential energy it has. After the reading “what is voltage?”
Voltage is like water pressure a “force” that causes the current to flow
Current The rate (“speed”) at which electrons flow Unit- ampere (A) (aka “amps”) An amp is one coulomb of charge per second
Resistance Opposes the rate of flow of charge Unit- Ohms ( )
Resistors- anything that creates resistance in a circuit. (slows down current) Can you think of any examples?
How are resistance and current related? - Lab and worksheet
An amp is one coulomb of charge per second A coulomb is the unit for charge There are about 6.24x 10 18 electrons in one coulomb