Question 1
Question detail
If a device operates at a power of 100 watts, how much energy does it transfer in 5 seconds?
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 100 watts, how much energy does it transfer in 5 seconds?
Answer
The energy transferred is 500 joules.
Explanation
This question assesses the student's ability to apply the relationship between power, energy, and time. It requires them to use the formula: energy = power x time. This answer is linked to Power because it applies the learning objective: Recall that 1 watt is equivalent to 1 joule per second.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Confusing Power and Energy
Students often confuse power (watts) with energy (joules), thinking they are the same.
Remember that power is the rate at which energy is transferred, defined as 1 watt being equivalent to 1 joule per second.
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