Central Power

Germany
Austria-Hungary
Ottoman Empire (joined the Central Powers in 1914)
Bulgaria (joined the Central Powers in 1915)
Also, Italy was technically a Central Power in 1914 because it belonged tot he Triple Alliance of Germany, Austria-Hungary and Italy


the Allied powers were
1914
1.Great Britain
2.Russia
3.France.
4.Belgium'
5.Serbia
6.Austria-Hungry
the later...in
1917
6. the US joined.

the Triple Alliance brought Italy into the alliance previously agreed between Germany and Austria-Hungary (in 1879) as a counterweight to France and Russia.