No. The rating on the power supply means: "This power supply maintains 6 volts between its terminals, and will supply whatever current is required by the device it powers, as long as that current doesn't exceed 1.8A for very long."
Since the equipment is only expected to need 600-1000 mA (that's 0.6 to 1 A), that power supply will support it nicely, and neither the power supply nor the equipment will damage the other.
Because equipment operating on DC is usually low-power electronic equipment, and it uses a power-supply to convert the house AC supply to DC at the right voltage. Most appliances needing high power are designed to run on AC because that is the normal supply to houses.
Information Technology Equipment
Power supply units are rated based on their output and efficiency. When more equipment is connected, a higher output power supply is needed.
The power supplied by a three-phase supply, or any supply come to that, is determined by the LOAD, and not by the supply. So you must look at the data provided on the equipment's nameplate to find out what its power rating is.
A UPS is an abbreviation for an "Uninterruptible Power Supply". The purpose of this device is to provide power when the main power source fails. UPS battery backups are used to provide power for computers, data centers and various other types of equipment. Typically the back-up is used with equipment that cannot have a disruption in the power supply, or equipment which may be damaged if there is a disruption in the power supply.
Most often, power supplies for any type of equipment is givin to you when you buy what the power supply is for.
Transformer Power Supply
no no no no no no no no no no no
Alternating current
To give steady voltages at the levels the equipment requires.
Everything would work as designed if you used a 2 amp power supply for a 200 ma circuit.It's important to not go OVER the designed capacity of the power supply, and in fact, it's a good idea to make sure the power supply has at least double the capacity of the load current.
A power supply that is designed to be outside the case of the computer. Most laptop computers use an external power supply rather than an internal one to reduce size and weight while the laptop runs on battery power.