24 Questions
What is the SI unit of power?
Watt
What system of units is the watt a part of?
International System of Units
What is the term used to describe the international system of unit?
SI System
What is the unit of work?
Joule
What is the definition of the watt in terms of energy?
One joule per second
What is the physical quantity that is measured in joules?
Energy
What is the unit of energy that is related to the watt?
Joule
What is the mathematical relationship between work and force?
W=F×∆r
What is the dimension of the unit of work?
kg·m²/s²
Is work a scalar or vector quantity?
Scalar
What is the unit of energy?
Erg and Joule
What is the equivalent of 1 joule in ergs?
107 ergs
What is the relationship between joule and erg?
Joule is a larger unit than erg
What is the term for the done work from the body?
Work
What is the unit of power that is related to energy?
Watt
What is the unit of power in the given equation?
Watts
What is the fraction of energy conversions in the body that is represented by the conversion of energy into work?
A small fraction
What is the value of power in the given equation?
64 watts
What is the purpose of the equation Power = Work/Time?
To calculate the power of a system
What does the equation Power = 6.9 x 10^5 J / 3 x 3600 sec represent?
The rate of energy conversion into work
What is the value of v^2 when K = 6.7 × 10^(-19) J and m = 9.11 × 10^(-31) kg?
1.47 × 10^12 m^2 / s^2
What is the speed of the electron in m/s?
1.21 × 10^6 m/s
What is the term used to describe the energy storage mechanism?
Potential energy
What is the mass of the electron in kg?
9.11 × 10^(-31) kg
Study Notes
SI Unit of Power and Energy
- The SI unit of power is called the watt.
- Power is calculated as Work/Time, where 1 watt is equal to 6.9 x 10^5 J/3 x 3600 sec.
Work and Energy Conversion
- The conversion of energy into work represents only a small fraction of the total energy conversions of the body.
- Work is a scalar quantity, measured in joules (J).
Unit of Work and Energy
- The unit of work is a joule (J), which is equal to 1 newton × 1 meter.
- 1 joule is equal to 1 kg × m² / s².
- Energy is also measured in joules, with 1 J being equal to 10^7 ergs.
Kinetic Energy
- Kinetic energy (K) is calculated using the formula K = 0.5 × mv^2.
- Using the given values of K and m, the velocity of an electron can be calculated as 1.21 × 10^6 m/s.
Potential Energy
- Potential energy is a mechanism of energy storage, often referred to as the energy storage mechanism.
- It is a type of energy that is stored in an object or system.
Learn about the international system of unit for power, which is commonly referred to as the watt. Take this quiz to test your understanding of the fundamental unit of power.
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