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Examples & Code

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R=rho*l/A rho=R*A/l l=R*A/rho A = rho*l/R

	R - resistance [ohm]:	rho - resistivity [ohm*m]:	l - length [m]	A - area [m^2]

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C=Q/V		Capacitance = Charge / Voltage
C=Q/V Q=CV V=Q/C	C - Capacitance	Q - Charge [C]	Voltage

1/Ceq=1/C1+1/C2+.+1/C5		Capacitors in Series
1/Ceq=1/C1+1/C2 1/Ceq=1/C1+1/C2+1/C3 1/Ceq=1/C1+1/C2+...+1/C4 1/Ceq=1/C1+1/C2+...+1/C5 1/C1=1/Ceq-1/C2	Ceq - Equivalant Capacitance	C1	C2
	C3	C4	C5

sigma = Q / A		Charge Density = Charge / Area
sigma=Q/A Q=sigma/A A=Q/sigma	sigma - Charge Density [C / m^2]	Q - Charge [C]	A - Area [m^2]

U=.5C(deltaV)^2		Potential = half Capacitance times difference in voltage squared
U=.5CV^2 C=2U/V^2 V=sqrt(2U/C)	U - Potential Energy [J]	C - Capacitance [f]	deltaV - change in voltage [V]