Unit 9 Current Electricity

Quest Online Homework due 5/10 and 5/17
Resistance of a Light Bulb lab due 5/19
Unit Test 5/20

Current ElectricityUnit Goals

Know meanings of potential difference (voltage), current, resistance, power. Be able to use appropriate relationships between them with correct abbreviations and units.

Properly use the terms series, parallel and circuit.

Draw and decipher circuit diagrams.

Determine current, resistance, potential difference and power output for any part of a circuit, including

Simple circuits, series circuits, parallel circuits and complex circuits with both series and parallel elements.

Describe what affects an object’s resistance and categorize resistors as ohmic or nonohmic

Interpret graphs about resistance I vs. V and V vs. R.

Know how to include ammeters and voltmeters in a circuit and what this says about their resistances.

Describe the structure of a capacitor.

Use transient currents to describe how steady state voltages and currents are established.

Describe how houses are wired and the role of circuit breakers.

Determine loss of energy to heat in wires and describe how it can be reduced.

Trace the conducting path through light bulbs.

Describe the production of electrical energy in batteries and the role of internal resistance.

Use the pressure metaphor for voltage and interpret color-coded voltage diagrams.

Static Electricity goals and review key

Goals

1. Describe what it means for an object to be charged or neutral.


2. Describe three methods of charging.


3. State coulombs law and use it to describe the size and direction of electrical forces.


4. Sketch the electric field lines around point charges, dipoles and plates.


5. Sketch equipotential lines around point charges, dipoles and plates.


6. Qualitatively describe electric field strength, electric potential energy and voltage/potential and distinguish between them.


7. Solve problems with Coulomb’s law and the equations for electric field strength, potential energy and voltage.


8. Qualitatively explain electrical phenomena like lightning, static cling, shocks, grounding.


9. Describe the charge of an electron and how it was determined.
   
   Review Key.
   Note That the answer to problem 9 is wrong and should be 111,803 N/C.
   

Static Review Key

Light Review Key

Even though the document may look blank below, you can still follow the link to the document. Light Review Key

Light Goals

1. What is Light? Be able to describe and give effective examples of the strengths and weaknesses of the two models of light. 2. How does light behave? Reflection: What is the law of reflection? Be able to locate images and make ray diagrams. Refraction: What is refraction? What is Snell’s Law? How did we determine a law for refraction? Be able to solve problems and draw ray diagrams. Colors: What are primary, secondary and complementary colors? How are colors produced by dispersion, add and subtract of light? Lenses: Be able to draw ray diagrams for converging lenses. Identify images as real or virtual. Others: Explain the production the color of the sky and sunset. Summarize how diffraction and interference apply to light.

sound review sheets

sound review sheets

Sound Unit

Goals
1. Explain what a wave is.
2. Differentiate between longitudinal and transverse waves
3. Correctly use the vocabulary: medium, pulse, crest, trough, compression, and rarefaction.
4. Define and apply the following wave characteristics: period, frequency, velocity, wavelength, amplitude, and energy.
5. Apply the following relationships: T=1/f and v =f*wavelength.
6. Explain how standing waves are produced and correctly use the terms nodes and antinodes.
7. Explain the following wave behaviors, interference, beats, resonance, doppler effect and sonic booms.

Key dates:
Online Homework : due monday evening 2/14
Speed of sound lab : performed 2/10. due: negotiable, but probably 2/18
Test 2/19. Class 2/18 will not be a review day, but instead a lab day for the next unit.

Summer Science Internships

This is a great opportunity to do interesting work over the summer, get paid, see real science being done, prepare a science fair project, and/or build a diverse college application.

No seniors unfortunately.

I really encourage you to look into it.
Application deadline is Jan 21.


http://www.saturdayacademy.org/ASE/GeneralInformation/tabid/224/Default.aspx