Question

ETHANHUNT PLS HELP

A light bulb converts electrical energy into light energy and also some thermal energy.  The amount of electrical energy is 50 Joules before the conversions.  
What is the total amount of energy from before the conversions to after the conversions?  

45 Joules because some energy is lost when it is put off as heat.

100 Joules because you start with one form of energy and end up with two forms, so the amount of energy doubles.

50 Joules because as energy converts from one form to another, it cannot be created or destroyed during the conversion. 

55 Joules because as more electricity comes in to the light bulb, the Joules increase.

Answer 1

The correct answer is 50 Joules because as energy converts from one form to another, it cannot be created or destroyed during the conversion

Answer 2

The answer is 45 Joules because some energy is lost when it is put off as heat.

When energy is converted there will always be less after the conversion than before, because of the thermal energy loss. Just like it is easier to push something if it is on ice than if it is on grass. That is because there is less friction on the ice to convert some of the energy into thermal energy (or heat)

I hope this helped!! :)