no
To measure the amount of amps (A).
They don't need to, but if it is digital, it may have them. (Ohmmeters must have a battery)
Ammeters measure the current flowing through a circuit
To predict the readings on two ammeters in a circuit, you need to analyze the circuit configuration and the current paths. Each ammeter will measure the current flowing through the branch it is connected to. By applying Kirchhoff's current law and Ohm's law, you can calculate the currents through each branch and determine the readings on the ammeters.
the battery in them do you need to replace them with watch batterys
if we did'nt have batterys we would'nt be able to use a torch
Somethimes we don't need them.
Laptops have batterys, Desktops dont.
you need a batery charger not batterys
it needs to eat eat copper and metal or maybe batterys at times to get energy
Ammeters are added in series to the circuit to be monitored.
any place that sales car batterys can tell you what size you need, butch