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John Denker is correct that the typical voltmeter reads zero if we set it to
AC and feed it a DC level. However, this is only true if the DC level is
truly DC. Hook a 1.5-volt battery to the voltmeter (set to AC) and it will
give a "temporary" reading. It initially responds to the change, and keeps
responding if the change keeps occurring (e.g. connect, disconnect, connect,
disconnect, etc.). /snip/
Michael D. Edmiston, Ph.D.