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Power

  • Machines like car engines continually shift energy from one energy store to another throughout a duration.
  • The pace of this energy transfer, termed power, denotes the rate of work done.
  • Time plays a crucial role in understanding power.
  • When two cars expend an identical amount of energy or perform the same amount of work to accelerate over a distance, the one with higher power accomplishes this task in a shorter timeframe.

Power | Physics for GCSE/IGCSE - Class 10

  • Two electric motors raise an identical weight by the same height, yet one motor lifts it more rapidly than the other.
  • The motor that elevates the weight at a faster pace possesses greater power.

Power | Physics for GCSE/IGCSE - Class 10

  • Appliances are assigned power ratings to indicate the energy transferred per unit time.
  • Common power ratings are detailed in the table below:

Power | Physics for GCSE/IGCSE - Class 10

Question for Power
Try yourself:
What does power in a power machine represent?
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Calculating Power

  • Since power is defined as:
    The rate of doing work
  • And work is:
    Work done = energy transferred
  • Then, power can be expressed in equation form as:
    Power | Physics for GCSE/IGCSE - Class 10
  • In the equations:
    • W or ΔE represents the work done or energy transferred, measured in joules (J).
    • t denotes time, measured in seconds (s).
    • P signifies power, measured in watts (W).
  • It's important to note that although these equations may be expressed differently, they convey the same concept - the transfer of energy over time.
  • The rearrangement of this equation can be facilitated with the assistance of a formula triangle.

Power | Physics for GCSE/IGCSE - Class 10

The document Power | Physics for GCSE/IGCSE - Class 10 is a part of the Class 10 Course Physics for GCSE/IGCSE.
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FAQs on Power - Physics for GCSE/IGCSE - Class 10

1. What is power in the context of physics?
Ans. Power in physics refers to the rate at which work is done or energy is transferred. It is measured in watts (W) and is calculated by dividing work or energy by time.
2. How is power calculated in a system?
Ans. Power can be calculated by dividing the amount of work done or energy transferred by the time it took to do so. The formula for power is P = W/t, where P is power, W is work, and t is time.
3. What are the different units used to measure power?
Ans. Power can be measured in various units such as watts (W), kilowatts (kW), horsepower (hp), and BTUs per hour (BTU/h), depending on the context and scale of the system being analyzed.
4. How does power relate to energy consumption in everyday life?
Ans. Power consumption is a key factor in determining energy usage and cost in everyday life. Understanding power can help individuals and businesses make informed decisions about energy efficiency and conservation.
5. How does power play a role in the performance of electronic devices?
Ans. The power of electronic devices affects their performance, efficiency, and battery life. Managing power consumption is crucial in optimizing the functionality and longevity of electronic devices.
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