Question

draw a sankey diagram for a light bulb that has energy input of 100 j and an energy output of 10j of light energy and 90j of heat energy​

Answer 1

Explanation:

For example, 100J of chemical energy from a battery is transferred electrically into 100J of output energy in a flashlight. A flashlight is used to provide light.

If 15J comes out as light, then the other 85J is wasted as thermal energy, and the efficiency of the flashlight is 15%.

If 10J comes out as light, then 90J is wasted as thermal energy, and the efficiency of the flashlight in this case is 10%.

100J of input energy is always transferred into 100J of output energy.