The ripple frequency produced by a full-wave power supply connected to a normal household circuit is:

A standard North American household electrical circuit operates at an AC frequency of 60 Hz. This means the voltage waveform completes 60 full cycles (one positive half and one negative half per cycle) every second. A full-wave rectifier actively flips the negative half of each AC cycle so that it becomes positive. Because both the positive and negative halves of the original 60 Hz cycle are converted into positive pulses, there are exactly twice as many 'bumps' or pulses per second at the output. This doubling effect results in an output ripple frequency of 120 Hz (2 x 60 Hz). A half-wave rectifier, which simply blocks the negative half, would retain a 60 Hz ripple.