Multiple Choice
Which of the following is a likely result of using a more powerful motor to run an elevator?
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9. Work & Energy
Power
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Which of the following is the correct SI unit for power?
A
(joule)
B
(watt)
C
(volt)
D
(newton)
Verified step by step guidance1
Step 1: Understand the definition of power in physics. Power is the rate at which work is done or energy is transferred over time.
Step 2: Recall the formula for power: \(P = \frac{W}{t}\), where \(P\) is power, \(W\) is work done (or energy transferred), and \(t\) is time.
Step 3: Identify the SI units for work and time. Work is measured in joules (J), and time is measured in seconds (s).
Step 4: Substitute the units into the power formula to find the unit of power: \(\text{unit of } P = \frac{\text{joule (J)}}{\text{second (s)}}\).
Step 5: Recognize that the unit joule per second (J/s) is defined as a watt (W), which is the SI unit for power.
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