The old style (incandescent) light bulb converts more energy into heat than it does into light. If you're using it mainly as a source of light, then it's a bummer, and its efficiency is very low. BUT ... if you're using an incandescent light bulb as a heater, then its efficiency is much better. It all depends on your point of view.
<span>You have multiple confounding variables, you cannot accurately conclude the relationship between the manipulated and dependent variable because the other variables that are not controlled for could be the reason for seeing a certain change</span>
1: only half the outlet is switched and the lamp is in the other half 2: the lamp is turned off. 3: The light bulb is burned out 4: the switch might be broken 5: the fuse might be blown 6: the electricity might be off
