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Capacitor

Capacitor. Charged plates each store charge. Positive charge at higher potential Negative charge at lower potential The charge storing device is called a capacitor . Old term condenser. Parallel Plates. +. -. +. -. Capacitance.

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Capacitor

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  1. Capacitor

  2. Charged plates each store charge. Positive charge at higher potential Negative charge at lower potential The charge storing device is called a capacitor. Old term condenser Parallel Plates + - + -

  3. Capacitance • The measure of a device to store charge at a given voltage is its capacitance. • The unit of capacitance is the farad (F). • 1 F = 1 C / V • Farads are a large amount of capacitance • Microfarads (mF) and picofarads (pF) are common

  4. A metal sphere with a 0.25 m radius is in a vacuum. Find the capacitance. Note there is only one surface, but the formula still works. The potential of the sphere is The capacitance is For the sphere C = (0.25 m) / (8.99 x 109 Nm2/C2) C = 28 x 10-12 F = 28 pF. Isolated Charge

  5. A capacitor is made from two plates. Area A Distance d The field is due to the charge on the plates E = Q/Ae The voltage is V = Ed. The capacitance is Parallel Plate Capacitor + - + -

  6. A key on a keyboard is a parallel plate capacitor. A springy insulator separates the plates. A circuit measures the capacitance from each key. If pressed d decreases The capacitance increases The circuit records the key Keyboarding

  7. Two capacitor charged by the same potential are in parallel. The voltage is the same across each capacitor. The charge will be equal to the total from both. The total capacitance is the sum of the individual capacitances. + - Two Capacitors C1 + - C2

  8. Two capacitors connected is sequence with the ends separated by a potential are in series. The total charge on the middle section must be neutral. Same charge on capacitors Voltages sum to the total + - Series Capacitors + - C1 C2 next

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