Concept 0 - Capacitance C = q V C = capacitance (Farads)

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Presentation transcript:

Concept 0 - Capacitance C = q V C = capacitance (Farads) q = Charge on the capacitor (C) V = voltage across the capacitor (V) + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Example: A CCD pixel has a capacitance of 1. 7x10-12 F Example: A CCD pixel has a capacitance of 1.7x10-12 F. What is the voltage across it if it has been charged 6.0x104 electron charges? (1 e = 1.602E-19) 5.7 mV

What is the charge on a 250 microfarad capacitor if it has been charged to 12 V? q = CV = (250E-6 F)(12 V) = 3E-3 Coulombs .0030 C

What is the capacitance of a CCD pixel if it has What is the capacitance of a CCD pixel if it has .014 V across it when it has a charge of 2.13x10-15 C? C = q/V = (2.13E-15 C)/(.014 V) = 1.52x10-13 F 1.52x10-13 F

A 0. 34 pF CCD pixel has 1350 electron charges on it A 0.34 pF CCD pixel has 1350 electron charges on it. What is the voltage across it? 0.64 mV

A 0. 57 pF CCD pixel has a voltage of 2. 3 mV across it A 0.57 pF CCD pixel has a voltage of 2.3 mV across it. How many electron charges does it hold? about 8200 electron charges