State the purpose of kWh meter.
Purpose of kWh meter is to measure the electric energy consumed in kWh for which the electricity bill is to be paid. i.e. units of energy consumed.
State the function of each of the following in a house circuiting :
(a) kWh meter, (b) main fuse, and (c) main switch.
Briefly state the purpose of functions in SQL environment.
State the purpose of ratchet in a screw gauge.