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2049_ch25B - Parallel and series capacitors-summary...

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PHY2049: Chapter 25 1 Î Capacitors in parallel Î Capacitors in series It is foolish to connect capacitors in series. + + = 2 1 eq 1 1 1 C C C + + = 2 1 eq C C C Example: 100 μ F in series with 10 μ F is 9 μ F (check yourself). The 100 μ F capacitor will be totally wasted. Parallel and series capacitors—summary
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PHY2049: Chapter 25 2 Î Two capacitor in series C eq even smaller than smaller of the two Î n capacitors in series C eq even smaller than smallest of all smaller of two (continued) 2 1 1 1 1 C C C eq + = 2 1 2 2 2 1 2 1 / 1 C C C C C C C C C eq < + = + = L + + + = 3 2 1 1 1 1 1 C C C C eq less than 1 1 1 1 C C eq > 1 C C eq < smallest
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PHY2049: Chapter 25 3 Î Four 1 μ F in parallel. Find C eq. Î Four 1 μ F in series. Find C eq. Î 1.3 μ F and 2.0 μ F in series. C eq is: (a) 0.79 μ F (b) 1.65 μ F (c) 3.3 μ F Examples 4 μ F 0.25 μ F
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PHY2049: Chapter 25 4 Î Equivalent capacitance? 1 and 2 in parallel Together, in series with 3 Example: parallel-series combo 1.0 μ F 2.0 μ F 3.0 μ F 1.0 + 2.0 = 3.0 μ F 5 . 1 1 0 . 3 2 0 . 3 1 0 . 3 1 1 = = + = eq C 1.5 μ F
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PHY2049: Chapter 25 5 Î Charge on C 1 ?
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