an ampere-hour meter

a true watt-hour meter

a watt meter

none of these

a.c. power only

d.c. power only

a.c. as well as d.c. power

d.c. power and a.c. power after rectification

current

potential difference

capacitance

resistance

D.C. current and D.C. voltage

D.C. and A.C. current

A.C. voltage

A.C. current

Wattmeter and power factor meter

Frequency meter and tong tester

Phase sequence meter and energy meter

Ohm meter and megger