Microwave oven.
The Magnetron tube is quite different from the Klystron tube. The Magnetron tube is can only function as an oscillator only.
-- Older/cheap Christmas lights.-- Switches for lights and other household appliances, but not the household outlets.
eyeglasses
A magnetron is a high-power, high frequency vacuum tube. The magnetron is the source of radio-frequency energy in RADAR systems and in the microwave oven in your kitchen, for example.
A magnetron tube inside of the microwave produces the waves and a fan circulates them.
copper
The microwave cannot cook food without the magnetron that causes the food to heat up!
A magnetron may be used to generate radio-frequency currents and fields at high power and high frequencies. The source of RF in most microwave ovens is a magnetron.
One can find an electricity cost calculator for household items by browsing local stores that sell household items. A good place to start would be a home depot or online sites such as Amazon.
A sampling unit is an object for which data are collected. For example, if you were studying the health of trees in a park, your sampling units would be individual trees; if you wanted to find out how many cars each household had then the unit would be a household. In the latter case you would probably contact only one member of the household but the data collected are relevant to the whole household.
You would find an ad for cookies in women's magazines. Many women do the shopping for the household.
The cavity magnetron was used in RADAR during WW2 ~ see related link below .