In American English... this is a flashlight: http://www.omgtop5.com/wp-content/uploads/2014/10/iHandy_Flashlight_Pro.jpg this is a lantern: https://c1.staticflickr.com/5/4050/4346840788_e471c9643a.jpg and this is a torch. As you can see, a torch is totally something different for us Americans. In fact, our Statue of Liberty carries a torch. http://levelsave.com/wp-content/uploads/2013/02/torch.jpg The Statue of Liberty with her torch: http://www.ladytorch.com/images/statue-of-liberty-torch.jpg

"Flashlight" is U.S., "torch" is U.K.

Flashlight se refiere al artefacto que emite luz mediante una bombilla activada mediante baterías, las conocidas linternas. Lantern es la lámpara que funciona con líquidos combustibles, por ejemplo la famosa Coleman. Torch es antorcha.