Week 10 Circuits
Task 1 Ohm’s Law
Lesson 12 Inverse Proportionality. Relationship between current and length of wire
After gathering data you found that as the length of wire increased the current decreased.
Recall the type of relationship this demonstrates.
Remember that in this lesson you kept the voltage constant. Now you can apply the thinking from Lesson 11 above and write an expression relating voltage, current and wire length.
Recall the type of relationship this demonstrates.
Remember that in this lesson you kept the voltage constant. Now you can apply the thinking from Lesson 11 above and write an expression relating voltage, current and wire length.
Georg Ohm was a physicist, mathematician and a teacher. He was the first to use Alessandro Volta’s electrochemical cell to demonstrate the relationship between voltage, current and resistance in a circuit. Ohm published his work on the mathematics associated with electrical circuits in 1827. We honour him today by naming the unit of electrical resistance the ohm.
Ohm found an inverse relationship between current and resistance when the voltage was kept constant. Use the concept of balance and inverse proportionality from Lesson 11 to write the mathematical expression using the symbols; V for voltage, I for current and R for resistance. 
Circuits  current, voltage and resistance
electrical_circuits.pptx  
File Size:  1636 kb 
File Type:  pptx 
Task 2
Review of electricity concepts from Physics Program
Use the Checklist on the Home page to review all concepts from "The Eye" onwards to the end of the program.
Use the Checklist on the Home page to review all concepts from "The Eye" onwards to the end of the program.
Task 3 Visit the following sites to help you build your conceptual model of how energy is transferred.
You have learned that light has both properties of a wave and a particle.
Click on the button to the right to watch the short video. Check your understanding by completing the online questions. The Heisenberg Uncertainty Principle helps to explain the wave/particle duality. Click on the button to the right to visit the eTED site. Watch the video and complete the online questions.
