NCERT Solutions for Class 9 Science Chapter 11
Important NCERT Questions
Work and Energy
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-156
Questions No-4
Define average power.
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1. Definition:
– Average power refers to the average rate at which work is done or energy is transferred over a specific period of time.
– It represents the ratio of total work done or energy transferred to the total time taken.
2. Formula:
– The formula for average power (P_avg) is:
P_avg = Total WorkTotal Time
or
Pang =Total Energy Total Time
– P_avg is measured in watts (W).
– Total Work or Total Energy is the overall amount of work done or energy transferred during a specified period.
– Total Time represents the duration over which the work or energy transfer occurs.
3. Calculation Over Time:
– Average power considers the total work or energy transferred and divides it by the total time taken, giving an average rate of energy use or transfer.
4. Representation of Consistent Rate:
– It indicates the consistent rate at which work is done or energy is transferred over the specified time frame.
5. Application:
– Average power is widely used in physics, engineering, and practical applications to assess the average energy consumption, production, or transfer rates of systems, machines, or processes over a given duration.
Understanding average power is essential for evaluating the sustained performance of systems or devices over a specified period, providing insights into their average energy use, production, or transfer rates during that time.