An apron is a garment that is worn over your other clothes to protect them. They are most often worn for cooking and washing dishes, but are used in many other professions as a protective garment. carpenters and butchers are often seen in aprons.
A can opener, or tin opener, is a device used to open cans of food. There are many different styles of can opener, including a simple blade, a small blade and a handle you can turn around, two wheels and a handle to turn them around, and an electric machine that does all the work for you.
The first bladed can openers were invented in the 1850s. Single wheel design can openers were invented in 1870 but the two wheeled model - one sharp wheel, one serrated wheel to hold the can - was only invented in 1925.
A kettle is a container that is used to boil water in. They are designed to be used over a stove or fire, although the more recent electric kettle simply plugs into a power point. Kettles have a spout to pour from and a handle to hold it, very similar to a jug.