Hi I'm completely inexperienced when it comes to current but I'm learning 
I have a question about servo Motors the 996 model the data sheet says that they need between 500-900 mA and I have 6 servos.
Now if I take the average of one servo and multiply by 6 I need 4.2 amps at 5 volts is my calculation correct or do I need to consider other things thank you!
Welcome to the forum
In theory all of your servo could start or be stalled at the same time so each take their maximum current at the same time. If so, then you need a power supply capable of providing 5.4A
Realistically this is unlikely to happen and you can program defensively to prevent it, so a power supply capable of providing 4.8A would seem to be sufficient
You probably didn't look at the stall current, which is 2.5Amp@6volt for the MG996.
Leo..
Thanks for answering
I have a ps that delivers 5 amp 3 servos should never stall but 3 of them are stressed harder when extending the arm and should stall what I just don't understand is the servos lift the arm without problems but then stall when they stop Should i get stronger servos ?[quote="Wawa, post:3, topic:1028788, full:true"]
You probably didn't look at the stall current, which is 2.5Amp@6volt for the MG996.
Leo..
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Servos briefly draw the start/stall current every time they start moving. For the MG996R, the power supply must be able to provide 2.5 Amps per servo, so 7.5A for three.
I'm getting a 15 amp ps soon what I don't understand is why can the servos move the arm easily but when holding they make noise because they hold the position and stall
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