Why are the units of internal energy and work "joules"?

First of all, internal energy and work are proved by science to be work, which is actually the transformation of energy. Internal energy is another form of energy, so the unit of energy is Joule
What's more, it all depends on Joule's contribution

The relationship between Joule heat and electric energy is going to be tested

When electricity is consumed, it will be converted into internal energy (Joule heat), mechanical energy and other forms of energy
When electric energy is completely converted into heat, the formula is universal
E = w = Pt = uit = u ^ 2T / r = I ^ 2rt = q (Joule heat)
This kind of circuit is also called pure resistance circuit“
However, electric energy is not completely converted into heat, such as electric motors,
For the calculation of Joule heat, only the following formula can be used:
Q=I^2Rt
The calculation of electric energy should use: e = w = uit = Pt

How to convert energy into heat

1 kJ = 1000 joules
1 kcal 1 kcal = 1000 kcal
1 kcal / 1 kcal / 1 calorie (kcal) = 4.184 kJ
1 cal = 4.182 J
Every 100 grams (kJ) of food, so divide by 4.18, that's 100 grams of calories

Can heat units be converted into temperature units? What is the formula
.
For example, 100k =? C

The description of the topic is wrong! The unit of heat is the unit of energy, which can not be converted into the unit of temperature! However, for example, 100k, I do not know whether the absolute temperature is 100 degrees. If so, the conversion relationship between absolute temperature and centigrade temperature is: absolute temperature - 273 = centigrade temperature
That is: 100k = - 173 ° C

Why are the units of internal energy and work "joules"?