On 06/06/2019 15:12, Harry Bloomfield wrote:
on 05/06/2019, supposed :
All Brian's points are incorrect except that they do often get stiff
due to limescale or corrosion.
A diode will give 240v x 0.707 rms volts, which is more than 120.

No, it will be 50% of the AC waveform, less a bit for the fraction of a
volt lost across the junction.

Quite, so half the power? Same voltage but half the duration?

If you halved the voltage, what would happen to the power?

0.707 x the peak AC is the RMS voltage.

And 0.707 of the rms voltage gives you half the power.

snip