How many different ways can a test charge be forced to the right in the diagram? Welcome to a Great Physics Day!

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Presentation transcript:

How many different ways can a test charge be forced to the right in the diagram? Welcome to a Great Physics Day!

Today’s Agenda: Discuss yesterday’s assignment Lesson: Potential Difference and Capacitance (Sec. 21.2) HW: Pg. 586 #76-83 (for tomorrow) Study pg (by Friday’s test)

Learning Goal: Students will be able to… Explain (sort of) what is meant by electric potential difference. Solve problems with the formulas  V=W/q and  V=Ed. Describe what capacitors are used for, and how they work. Perform calculations with the equation C=Q/V.

Potential Difference:  V = W/q Potential Diff. Small Test Charge moving in the Field Work done in moving q Units: J/C = Volts (V)

Potential Difference:  V = Ed Potential Diff. between 2 parallel plates Distance between the plates E-field between the plates

Example: The electric field intensity between two charged plates is 3,200N/C. If the plates are separated by 1.5cm, what is the potential difference between the plates? How much work is required to move an electron from one plate to the other?

Capacitance: A capacitor is a device designed to store charge. A basic capacitor consists of two parallel plates separated by some distance, which can be charged by connecting the two plates across a potential difference.

Capacitance: Batt

Capacitance: For a given size and shape of capacitor, the charge stored depends on the potential difference (of the battery).

Capacitance: Another way to say this: The ratio of charge to potential difference is a constant (for a given capacitor). C = Q / V Charge Stored Units: C/V = Farads (F) Potential Diff. Capacitance

Example: A certain capacitor is connected to a 6.0V battery, and 9.6x C of charge is stored. What is the capacitance of this capacitor?

HW Answers: 76.50V J x J C 80.90V N/C  F V Pg. 586 #76-83