A capacitor is made of two metal plates, insulated from one another, as shown in the figure below.
Explain why the capacitor is said to store energy but not charge.
Three uncharged capacitors X, Y and Z, each of capacitance 
, are connected as shown in the figure below.
A potential difference of 
is applied between points A and B.
Calculate the combined capacitance of the capacitors X, Y and Z.
Explain why, when the potential difference of is applied, the charge on one plate of capacitor X is 
.
Determine
the potential difference across capacitor X,
the charge on one plate of capacitor Y
.
in the circuit. Therefore, the charge on one plate of capacitor X is the total charge 
of the circuit and the potential difference 
across the circuit:
.
.
