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#flo #inclass
1 Ref it later #review
charging a battery is fundamentally shoving in current the wrong way
direction of flow doesn't really matter, wrong way of current flow just flips to neg
can walk in whatever loops on the rollercoaster
we need KBhPHYS201KirkoffsLaws
most engineers dont go back to the laws to solve a circuit. instead, they:
replace clusters of parrelles with one equivalent resistor "morph" the circuit
resistors in series -> one equivalent resistor one resistor in circuit
v=ir voltage = current * resistance
1.1 howto: calculating equivalent resistors
connected in series: the sum of the individual resistances.
R + R = 2R
Two resistors connected in parallel: The reciprocal of the equivalent resistance of two resistances connected in parallel is the sum of the reciprocals of the individual resistances. what??
1 / Req = 1 / R1 + 1 / R2 + 1 / R3
just add the reciprocals to get the INVERSE of Req
1.1.1 problem:
|--20--|
*--10-- --*
|--60--|
1/20 + 1/60 = 4/60 = 1/r2 flip, 60/4 = 15
15 + 10 = 25 \(\Omega\)
* -- {9v} -- 10 -- [20, 30] -- [40, 50] -- *
| R# | R | dV | I | P |
|---|---|---|---|---|
| 1 | 10 | 2.03 | .203 | 0.41 |
| 2 | 20 | 2.44 | .122 | 0.29 |
| 3 | 30 | 2.44 | .081 | 0.19 |
| 4 | 40 | 4.53 | .113 | 0.51 |
| 5 | 50 | 4.53 | .090 | 0.41 |
summing up parrelel: 10, 12, 22 ohm sum = 44 ohm 9V/44Ohm = 0.203Amps coming out of bat
1/10000+1/3300 + 1/1000
470 +
= 1183
1.2 power:
P = IV In Watts energy per second
add the resistors do the sodoku fill out the table