DAY 88

GOALS:

1. SWBAT understand the basic properties of electric charge.
2. compare electric force with gravitational force.
3. explain why a charged object in an electric field is considered to have electrical potential energy.
4. Express the units for electric potential.
5. Distinguish between potential and potential difference.
6. Solve problems using potential in uniform electric fields.

WARM-UP

1. Where might you find a circuit? List at least 5 places.
2. What is the purpose of a circuit?

CLASSWORK

1. Circuits Pre-Assessment

• Lets see what you already know about current and circuits. Later, we'll do this assessment again, and see how much you've learned
• You'll be looking at a number of wiring setups involving a simple circuit (light bulb).
• Ignore the portions of the instructions which tell you to 'tap' on the image. It won't work.
• For the first 12 questions, you'll need to decide which arrangements of wire, bulb, and battery result in a lit bulb. Occasionally, two scenarios will work. In that case, choose both.
• To document your answer, write the letter of the answer. For questions 1-12, call the left setup "A", middle "B", and right "C".
• Complete 1-30
• Assessment LINK

2. HW Review

3. Electric Potential Difference

- take notes, answer practice questions

- Slideshow: LINK

ANNOUNCEMENTS

1. Friction Rods Activity is due today

2. Complete the Handout on Electric Fields and Electric Field Lines (2 sides) (extra copies are on the seat next to my computer, or links to the handouts are on Day 86). Due Monday. Note: There will be a video posted here on Friday (LINK) covering how to complete the table in problem number 9.

3. Practice problems from Friday (today in class) are due Monday.

4. Extra Credit Opportunities: Due by Wednesday

A. 20 classwork points: Complete all four electric field charts correctly. Incorrect = zero points LINK

B. 10 homework points: Complete the Polarization activity (print out the handout, or recreate the drawing on a piece of paper) here: LINK

HOMEWORK

Video: LINK

Questions:

1. What is the equation for electric potential difference?

2. What are the dimensions of electric potential difference?

3. What is the symbol for electric potential difference?

4. Write the equation for electric potential difference in terms of electric field strength and displacement.

5. Is ΔV a vector or scalar?