Which of the following is a likely result of using a more powerful motor to run an elevator?

• A. The elevator can lift heavier loads or move faster than before.
• B. The elevator will consume less electrical energy for the same task.
• C. The elevator will automatically become more energy efficient.
• D. The elevator will require less maintenance regardless of usage.

Answer: (A)

Verified step by step guidance

1. Understand the role of the motor in an elevator: it provides the mechanical power needed to lift the elevator car and its load against gravity.
2. Recall that power is the rate at which work is done, and work done to lift the elevator is given by \(W = m g h\), where \(m\) is mass, \(g\) is gravitational acceleration, and \(h\) is height.
3. A more powerful motor means it can deliver a higher power output, which allows either lifting heavier loads (increasing \(m\)) or moving the elevator faster (increasing the speed, thus doing the same work in less time).
4. Consider energy consumption: using a more powerful motor does not necessarily reduce electrical energy consumption for the same task, because energy depends on work done, not just power rating.
5. Maintenance and energy efficiency depend on design and usage factors, not solely on motor power, so these are not guaranteed outcomes of using a more powerful motor.