We're deeply intrigued to know where the questioner resides, and from what
experience this question arises.
We know of no location in the world, and no small-scale situation, where direct
current is preferred for the mains supply.
Direct current.
Electricity is used. It is stored in the form of DC voltage. DC is direct current which is not what is used in your home. DC is used in storage batteries. AC or alternating current is what is used to power your home.
When you plug something into the wall socket at home, (mains power) you are using alternating current, when you use something powered by a battery, you are using direct current.
Some possible answers are: a battery (which produces direct current) or a generator of electricity generator, such as a dynamo (which produces direct current) or an alternator (which produces alternating current).
An electric current is not REQUIRED in a coffee maker, you can have a coffee maker that works on gas. If you are going to use electricity you could design one that used DC current or AC current. This said, as most houshold mains electricity supplies are AC, most commercially available coffee makers run on AC electricity.
It comes out as direct-current electric power.
Ernie Ramhoff
It must be direct current for electrolysis.
Generators produce electricity as direct current and Alternators produce electricity as alternating current. As alternators produce electricity more effeciently, and they are smaller and lighter and are used in modern vehicles.A generator creates direct current in the manufacture of power. An Alternator creates alternating current in the creation of power. Alternators can have diodes installed internally so that they have a D.C. output.
Alternating Current (AC) is the type of electricity typically used in households. With AC, the magnitude and direction of electricity vary. Direct current (DC) is a source of electricity that does not vary in direction. An example of a DC source is a battery, or solar cells. The main difference between the two types of currents is simply the direction, as made quite clear by the names: AC = varied direction and magnitude where as DC = continuous current. Alternate current cannot stored but direct current can be stored examples in case of battery cells
Direct current (DC) this is produced by for example batteries. AC alternating current changes direction on a cyclical basis and is used in power distribution and what "comes out" of the power sockets in the home.
Direct current (dc) electricity is used in many different things, including for example: digital watches and cameras, cellphones, laptop computers, mp3 players, cars, motorbikes ...