PHYSICS+11+CHAPTER+15+AND+18+ICE

FROM CHAPTER 15:

F = __kq1q2__ E = F/q therefore F = Eq r2 E = __ Σ ____ kq __ r2

Differences between charging by induction and charging by conduction.

Plotting field maps – all lines originate on a positive charge and end on a negative charge.

FROM CHAPTER 18: ** Chapter 18 ** - Connected in a series so if the last one is connected, every bit before it is i.e. Christmas Lights - Total Voltage (V) in Circuit = VT = V1 + V2 + V3... - Total Current (I) in Circuit = IT = I1 = I2 = I3... - Total Resistance (R) in Circuit = RT = R1 + R2 + R3...
 * Circuits Galore **
 * Series Circuit**

The power supply is analogous to a ski lift... ...Each drop in GPE is like the voltage used by each resistor

- Resistors create parallel lines so just because one doesn't light, that doesn't mean the rest won't work because they can be reached w/o passing through the broken one i.e. Hannukiah Lights - Total Voltage (V) in Circuit = VT = V1 = V2 = V3... - Total Current (I) in Circuit = IT = I1 + I2 + I3... - Total Resistance (R) in Circuit = __1__  = __1__  +  __1__  +  __1__ RT R1 R2 R3...
 * Parallel Circuit**

- Total resistance in parallels < in any individual resistor - If you have "n" resistors, all of resistance "R," then the total resistance in the parallel is R/n i.e. If I had 5 resistors, each of 30 Ohms, the total resistance for the combination is 6 Ohms. 1/30 + 1/30 + 1/30 + 1/30 + 1/30 = 5/30 = 6 **Units** - Power is measured in Watts = J/s - Voltage is measured in Volts = J/c - Current is measured in Amperes = c/s So since IV = Power = I(IR) = I2R of [V(V)]/R = V2/R
 * Factoids**

i.e. How much current can each resistor hold w/o blowing if 47 ohms and 0.25 watts are given? P = I2R --> 0.25W = I2(47) --> Imax = 0.073A V = IR = (47)x(0.073A) --> V = 3.43V I have 9V altogether. How many resistors are in the series? --> 3 resistors

** Network Circuits ** - Some resistors in series and some in parallel How to solve: Find one resistor which can replace all those in parallel and then just deal with a series circuit. This one resistor is called Req aka equivalent resistance.