Sorry, another physics question AQA GCSE P5.1 playing with AC and DC and oscilloscopes. 'Your teacher may now demonstrate half-wave rectification of an a.c. supply, in which a diode is used to stop current flowing in one direction.' Well their teacher may, if we could make it work ! I tried with the recommended 1N4001 diode, power pack on 1V, variable resistor bringing current to minimum. Plugged it in, momentarily saw a beautiful trace, then the diode fizzled and the trace went back to a straight line. Tried again with a bigger diode (1N5401) and I just get a jagged version of the original AC waveform. Tried a (new) 1N4001 with the sig gen instead of a power pack, still just a squiffy version of the normal waveform. Please can someone tell me what diode I need, and what else to put in the circuit ?! Or is it another example of someone writing a practical that sounds good on paper, but not actually checking that it works ?