Are overhead projectors better than those computer projectors teachers use now?



  1. 0 Votes

    From an energy use perspective I’d say that the computer projector is probably better because it uses less energy than an overhead projector. Overhead projectors uses incandescent bulbs which are very inefficient (about 90% of energy is lost as heat). While the computer itself will be using a lot of energy, the teacher will probably have to use a computer anyway, so making it double as a projector is more efficient.

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