I have been curiously measuring the output voltages of laptop and wall warts. The laptop ones give a rock steady DC voltage. Some 18v and some 19v. However, if I switch my multimeter's setting to AC instead of DC, in ALL the cases the v shown is almost twice the DC voltage. My question is, this AC voltage is it a ripple or is it normal? How can a 18v DC laptop adapter give out 33v AC? Or am I doing something wrong? I tested with two multimeters.
Thanks.
Thanks.