SI Unit of Power

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Questions and Answers

What is the SI unit of power?

Kilogram

Watt (correct)

Newton

Joule

What system of units is the watt a part of?

FPS system

CGS system

International System of Units (correct)

MKS system

What is the term used to describe the international system of unit?

Global Unit System

Metric System

SI System (correct)

Nuclear System

What is the unit of work?

Joule Signup and view all the answers

What is the definition of the watt in terms of energy?

One joule per second Signup and view all the answers

What is the physical quantity that is measured in joules?

Energy Signup and view all the answers

What is the unit of energy that is related to the watt?

Joule Signup and view all the answers

What is the mathematical relationship between work and force?

W=F×∆r Signup and view all the answers

What is the dimension of the unit of work?

kg·m²/s² Signup and view all the answers

Is work a scalar or vector quantity?

Scalar Signup and view all the answers

What is the unit of energy?

Erg and Joule Signup and view all the answers

What is the equivalent of 1 joule in ergs?

107 ergs Signup and view all the answers

What is the relationship between joule and erg?

Joule is a larger unit than erg Signup and view all the answers

What is the term for the done work from the body?

Work Signup and view all the answers

What is the unit of power that is related to energy?

Watt Signup and view all the answers

What is the unit of power in the given equation?

Watts Signup and view all the answers

What is the fraction of energy conversions in the body that is represented by the conversion of energy into work?

A small fraction Signup and view all the answers

What is the value of power in the given equation?

64 watts Signup and view all the answers

What is the purpose of the equation Power = Work/Time?

To calculate the power of a system Signup and view all the answers

What does the equation Power = 6.9 x 10^5 J / 3 x 3600 sec represent?

The rate of energy conversion into work Signup and view all the answers

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 Signup and view all the answers

What is the speed of the electron in m/s?

1.21 × 10^6 m/s Signup and view all the answers

What is the term used to describe the energy storage mechanism?

Potential energy Signup and view all the answers

What is the mass of the electron in kg?

9.11 × 10^(-31) kg Signup and view all the answers

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.

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Description

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.