Energy cannot be created or destroyed, it can only be transferred.
(for the love of God, please do not EVER forget that)
For example, when you turn on the lights in your room, you're not losing electrical energy, it's simply being converted to light energy. And even if your bulb(s) are/is not 100% efficient (which, let's face it, it probably isn't), the energy wasted as heat is not lost either. It's simply passed on to the particles in the air and transferred to kinetic energy (particles move around a lot in gases)
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