Version 4
SHEET 1 1152 680
WIRE 224 80 112 80
WIRE 112 128 112 80
WIRE 224 128 224 80
WIRE 112 272 112 208
WIRE 176 272 112 272
WIRE 224 272 224 192
WIRE 224 272 176 272
WIRE 176 288 176 272
FLAG 176 288 0
SYMBOL cap 208 128 R0
SYMATTR InstName C1
SYMATTR Value 1µf
SYMBOL voltage 112 112 R0
WINDOW 3 -32 -52 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 1 1)
SYMATTR InstName V1
TEXT 240 56 Left 0 !.tran 1
TEXT 296 104 Left 0 ;Current I through C1 = C1 * (dV1/dt)  : if V1=A*sin(w*t) then
TEXT 304 144 Left 0 ;I = A*w*cos(w*t) = A*w*sin(w*t + pi/2)
TEXT 304 176 Left 0 ;So current is a sin wave with a 90 degree phase shift and an
TEXT 304 208 Left 0 ;amplitude proportional to frequency