Term
what is the meaning of capacitance, and what is its units? 

Definition
the capacitance of a capacitor is the charge stored per unit of potentional difference across it. C = Q / V the units a re farads, 1F = 1CV^{1} 


Term
what is the equation to calculate the energy stored on a capacitor? 

Definition
W = ^{1}/_{2} C V^{2} the unit is joules J 


Term
1. what is the equation for capacitors in parallel? and how whould you calculate the charge? 2. what is the equation for capacitors in series? 

Definition
1. C_{total}= C_{1 }+ C_{2} Q = C_{total} x V 2. 1 = 1 + 1 C_{total }C_{1 } C_{2} 


Term
what are the three quantities that change as a capacitor discahrges? 

Definition
1. The chage stored, Q. 2. the current flowing, I. 3. the p.d across the capacitor, V. 


Term
what does the gradient and the area under a charge time graph represent? 

Definition
the gradient represents the current the area under teh graph represents the charge that has flowed from the capacitor. 


Term
what are the discharge equations? 

Definition
1. Q=Q_{0}e^{t/CR} 2. I = I_{0}e^{t/CR} 3. V = V_{0}e^{t/CR} 


Term
what is the time constant τ? 

Definition
the quatity CR is called the time constant and its unit is seconds. for a RC circuit (one in which a capacitor discharges through a resistor) 

