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How do you calculate the total MA needed to power 3 9v DC 200 MA devices? |
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The total current (MA) needed is the sum of the currents for each device. Each requires 200 mA, so three require 600 mA. As the previous poster said it's best to allow for some extra current.
By the way MA = Mega-amperes. A capital M means to multiply by one million. It's unlikely that your devices use 200 Mega-amperes each which equals 600,000,000 amperes total! You probably mean mA which means milliamperes. 200 mA equals 0.2 amperes which is a lot more reasonable!
Answer
You would need qty 1 9 volt power supply that is capable or delivering 600 ma. I would round up and get a 9 volt supply that can deliver 1 amp this would give you nearly 100% reserve. 600 ma is .6 amps
Good to have "reserve" power available. The above is true if you run the devices in parrallel, which is more common. However if you add the devices in series, you would need 27V at minimum 200mA.
First answer by Alanjones62. Last edit by Little mugwump. Contributor trust: 65 [recommend contributor]. Question popularity: 131 [recommend question]
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