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