1a how many ma

You can view more details on each measurement unit: uA or amps The SI base unit for electric current is the ampere. The milliampere is a multiple of the ampere, which is the SI base unit for electric current. Milliamperes can be abbreviated as mA; for example, 1 milliampere can be written as 1 mA. Ampere is the basic unit for measuring electrical current.

The ampere, commonly referred to as an "amp," is the electrical current constant equal to the flow of one coulomb per second. The ampere was previously defined as a constant current that when passed through two straight and parallel conductors that are spaced one meter apart, will produce a force equal to 0. The ampere is the SI base unit for electric current in the metric system. An ampere is sometimes also referred to as an amp. Amperes can be abbreviated as A ; for example, 1 ampere can be written as 1 A.

Also lose a little bit on the supply end, in terms of overall power supplied. I also, do overspec my power supplies on jobs, if it requires 2 amps I use 5, if it requires 1 amp I use Most failures Ive come across are from improper wire practice cable management and power related camera malfunction due to "plug a play" attitude that some "professionals" as well DIYers have when working with circuits all voltage. We now have all of our power supplies here as regulated so now there's no problem with using something larger than necessary as the camera is only going to draw the mA it needs to function properly.

You could make a case for that with a non-regulated supply, ie. A power supply that is not drawing current is not being used. Next time you find a working power supply, near its' rated capacity, and it is cool to the touch, please let me know.

I work with DC power supplies all day long. Always try to use a larger capacity power supply, and do your best to keep it cool. In my case my bosh camera is 12 Volts, but my power course is 48 volt I take it i was wrong, I must be thinking of the wrong volt input being dangerous. Well, from the theoretical point of view clearly extra current capacity is not going to help directly with voltage drop.

But as you have noticed and survtech has pointed out, 24 VAC transformers and older style or cheaper 12 VDC power supplies based on line frequency transformers tend to have poor regulation and so often output a higher voltage at lighter loads to make up for it. So that gives you a bit of extra headroom for wire losses. Modern general purpose 12 VDC switch-mode designs have excellent regulation and normally nothing to allow for voltage drops.

Over the entire current range it might not vary more than 0. Next to ensuring voltage drops are minimized, the ideal solution is to use a supply with an adjustable voltage output if the wire voltage drop will cut the voltage supplied to the camera below its minimum allowable value.

One suggestion of mine to you, as not to confuse you any further. Do not confuse voltage , amperage, and resistance. I use mine and I own several everyday. Some of my "higher end" Fluke models, actually generate their own milliamp signals, and can check an incoming milliamp signal also my Fluke model , H.

Start out with a nice Fluke model, and teach yourself how to check resistance, voltage, and amperage. Will help you out many times over, in the long run. Good Luck!! I've installed several dozen, or close to a hundred cameras, and now I have come to my greatest challenge. For instance, the 12 Mini domes, each dome is rated to take around mA to work, and the power supply is a 8amp 9 Channel and even though I double or triple up on each channels, it seems to be consistently delivering 1amp through each connection, and my cameras, through observation is not turning on.

This is really an odd situation, because I have tried plug in power supplies and I have been able to switch on the devices before but now, for some reason fuses are blowing up on the panel and there seems to be a short on a few of the channels,.

I have used a cheap made in hong kong china Power Supply with 16 channels, with a total of 6 Amps and the cameras do turn on. With that said, this is all weird. Definition: The ampere symbol: A , often referred to as simply amp, is the base unit of electric current in the International System of Units SI.

The ampere is defined formally based on a fixed value for the elementary charge, e, of 1. This definition is effective since , and is a significant change from the previous definition of the ampere. In the centimeter-gram-second system of units, the ampere was defined as one tenth of the unit of electrical current of the time, which is now known as the abampere.