Question detail
If a device operates at a power of 150 W for 20 seconds, calculate the energy transferred by the device during this time.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
If a device operates at a power of 150 W for 20 seconds, calculate the energy transferred by the device during this time.
Answer
3000 J
Explanation
This answer stays anchored to Energy stores and systems and uses the approved objective: Calculate changes in energy when a system is changed by work done as current flows..
Common mistake
Common Mistake in Energy Calculation
Students often confuse the work done by current flowing with the energy transferred, leading to incorrect calculations.
Ensure to use the correct formula for calculating energy changes, specifically relating work done to the energy transferred in the system.
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