Energy Resources And Energy Transfers: Units
Muhtasari
Energy appears in almost every branch of physics, and its unit - the joule - is one of the most frequently used in any exam paper. But energy calculations also pull in mass, speed, height, force, time, and power, each with its own unit. Keeping track of all eight is the price of getting the numbers right.
This reference lists the units the Edexcel specification requires for the Energy resources and energy transfers section: kilogram, joule, metre, metre per second, metre per second squared, newton, second, and watt. You will see where each unit enters the energy equations and practise quick conversions.
Malengo
- Use the following units: kilogram (kg), joule (J), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and watt (W)
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- What is the SI unit of energy? A) W B) N C) J D) kg Answer: C
- Power is measured in: A) joules B) watts C) newtons D) metres per second Answer: B
- Which set of units is needed to calculate gravitational potential energy using GPE = mgh? A) kg, m/s, m B) kg, m/s2, m C) N, m, s D) J, W, s Answer: B
- One joule is equivalent to: A) 1 kg m/s B) 1 N m C) 1 W m D) 1 kg m/s2 Answer: B
- A machine does 6000 J of work in 2 minutes. Its power is: A) 3000 W B) 50 W C) 12000 W D) 100 W Answer: B
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
Work, Power, and the Work–Energy Theorem
Describe and apply the work–energy theorem
"Physics: Work, Power, and the Work–Energy Theorem" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/9-1-work-power-and-the-work-energy-theorem. Access for free at https://openstax.org/books/physics/pages/1-introduction
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