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increasing capacitance! basics

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yellowmania

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have an ac supply a diode and a load resistor in series. After placing capacitors of varying values across it i found that with increasing capacitance the amplitude of the waveform on the oscilloscope decreased showing a smoothing effect! can anyone explain to me why this happens?
 

During the positive half of the AC cycle current flows through diode to the load and charges the capacitor. During the negative half of the AC cycle no current flows through the diode, so all the current for the load must come from the cap, causing it to discharge. The smaller the cap, the more the voltage will drop according to the equation;

i=C*dV/dt

or

dV=i*C*dT; where i is load current, C is capacitance dV is voltage change and dT is time change
 
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