Term

Definition


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Calculating Resistors in series Calculating Resistors in parallel 

Definition
Requ = R1 + R2 + R3... 1/Requ = 1/R1 + 1/R2... 


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Definition
Rule 1) assume direction of current Rule 2) Loop Rule: sum up all potential differences (ie Voltage) when going through the closed loop in a circuit = 0 


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Capacitors in series Capacitors in parallel (Q=CV) (W = 1/2CV^2) 

Definition
1/Cequ = 1/C1 + 2/C2... Cequ = C1 + C2... 


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steps for RC circuit and equation 

Definition
Step 1: figure out quatnity of interest (I,V,Q) when t=0 Step 2: figure out value at t=infinity Step 3: connect by exponantial using RC as time constant
Q(t)= CV e^(t/RC) + CV
(Vcap(t)= 1/C Q(t) = Vbatt (1e^(t/RC)) 


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a flash for a camera: C = 1200uf. what resistance is needed in the RC circuit if the flas is to charge to 90% of its full charge in 25 sec 

Definition
Q(t) = Qfin (1e^(t/RC)
Q(t) Q(25)  =  = .9 Qfinal Qfin
.9 = 1e^(25/R1200)
ln(e^(25/R1200) = ln (1.9)
25sec 25sec  = ln(.1) => R =   RC 1200uf*ln(.1) 


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formula for the magnitude of magnetic force 

Definition


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magnetic feild & work on charge 

Definition
when F is perpendicular to v, no work Fcentri = 1/r mv^2 mv r=  qB 


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electric force magnetic force > v=? 

Definition

