Question

in a ceiling fan, n, electrical energy is converted to m, kinetic energy. some of the energy is \wasted\ as heat. what is something you can do to minimize the energy dissipated as heat?
a turn off the light
b run the fan less than 4 hours/day
c only run the fan on low power setting
d make sure the motor and moving parts are lubricated to decrease friction

Explanation:

Step1: Analyze each option

• Option A: Turning off the light has no relation to the energy dissipation as heat in the ceiling fan.
• Option B: Running the fan less time just reduces the total energy consumption but not the proportion of energy wasted as heat.
• Option C: Running on low power setting reduces the total energy input but not the proportion of energy wasted as heat.
• Option D: Lubricating motor and moving parts reduces friction. Since friction causes heat generation (energy loss), reducing friction will minimize the energy dissipated as heat.

Answer:

D. make sure the motor and moving parts are lubricated to decrease friction