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level: 1. SI units

Questions and Answers List

level questions: 1. SI units

Question	Answer
Systèm Internationale d’Unites (International system of units).	SI Units-
the amount of matter in a body.	Mass-
a unit of charge.	Coulomb (C)-
6.24x10^18 electrons (one ampere second). Is defined as the quantity of electricity which flows past a given point in an electric circuit when a current of one ampere is maintained for one second. Thus, Q=It. I is the current, and t is the time in seconds.	1 Coulomb =
Unit of force.	Newton (N)-
1 kilogram metre per second squared. Is defined as the force which, when applied to a mass of 1kg, gives it an acceleration of one metre per second squared. Thus, F=ma, where F is the force, m is the mass in kgs, and a is the acceleration in metres per second squared.	1 Newton (N) =
Unit of work or energy. 1 Joule is 1 newton metre. Is defined as the work done or energy transferred when a force of one newton is exerted through a distance of one metre in the direction of the force. Thus, W=Fs, where F is the force and s is the distance in metres moved by the body in the direction of the force. Energy is the capacity for doing work.	Joule (J)-
Unit of power. 1 watt = 1 joule per second. Is defined as the rate of doing work or transferring energy. Thus, P=W/t, where W is the work done or energy transferred in joules and t is the time in seconds. Hence, energy in joules, W=Pt.	Watt (W)-
A unit of electric potential, where one volt is one joule per coulomb. Is defined as the difference in potential between two points in a conductor which, when carrying a current of one ampere dissipates a power of one watt. The electromotive force (e.m.f) is measured in volts.	Volt (V)