Compared to PSC motors, brushless DC motors:
A) More efficient, but not well suited for variable-speed applications.
B) Inexpensive, but also less efficient.
C) More efficient and better suited for variable-speed applications.
D) Are less efficient, but well suited for variable-speed applications.
C
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Why do gas furnace efficiencies jump from 80% to 90%?
A) Federal regulations do not allow the production of mid-efficiency furnaces B) The physics of combustion make it impossible to produce an 85% efficient furnace C) Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90% D) The blower used with 85% furnaces cannot be used for air conditioning
When electrical energy is applied to a device that can convert it to another form of energy, such as an electric motor converting it to mechanical energy, it performs ____.
a. transfer b. kinetic energy c. energy d. work