Metric Prefixes in Quantities and Units
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Questions and Answers

What is the unit of magnetic flux in the cgs system?

  • Tesla
  • Gauss (correct)
  • Newton
  • Ampere

    • What is the unit of temperature in the SI system?

  • Fahrenheit
  • Kelvin (correct)
  • Rankine
  • Degree Celsius

    • What is the symbol for the metric prefix representing 10^-15?

  • nano
  • micro
  • pico
  • femto (correct)

    • What is the full form of 'mks' units?

    <p>Meter-Kilogram-Second</p> Signup and view all the answers

    What is the purpose of metric prefixes?

    <p>To represent powers of ten</p> Signup and view all the answers

    What is the unit of length in the cgs system?

    <p>Centimeter</p> Signup and view all the answers

    Why is the mks system preferred in scientific and engineering work?

    <p>It is more widely used</p> Signup and view all the answers

    What is the value of the metric prefix 'femto'?

    <p>one-quadrillionth</p> Signup and view all the answers

    What is the symbol for the metric prefix representing 10^3?

    <p>kilo</p> Signup and view all the answers

    Why are some units from the cgs system still in common use?

    <p>They are still widely used</p> Signup and view all the answers

    Study Notes

    Quantities and Units

    • The metric prefix mega has replaced 10^6.

    Metric Prefixes

    • Metric prefixes represent powers of ten in engineering notation.
    • Table 3 lists metric prefixes with their symbols, powers of ten, and values.

    Examples of Conversion

    • 50,000 V = 50 * 10^3 V = 50 kV
    • 25,000,000 Æ = 25 * 10^6 Æ = 25 MÆ
    • 0.000036 A = 36 * 10^-6 A = 36 µA

    Converting between Units with Metric Prefixes

    • To convert from a larger unit to a smaller unit, move the decimal point to the right.
    • To convert from a smaller unit to a larger unit, move the decimal point to the left.
    • Determine the number of places to move the decimal point by finding the difference in the powers of ten of the units being converted.

    Examples of Metric Unit Conversions

    • 0.15 milliampere (0.15 mA) = 0.15 * 10^-3 A = 150 * 10^-6 A = 150 µA
    • 4500 microvolts (4500 mV) = 4500 * 10^-6 V = 4.5 * 10^-3 V = 4.5 mV
    • 5000 nanoamperes (5000 nA) = 5000 * 10^-9 A = 5 * 10^-6 A = 5 µA
    • 47,000 picofarads (47,000 pF) = 47,000 * 10^-12 F = 0.047 * 10^-6 F = 0.047 µF
    • 0.00022 microfarad (0.00022 mF) = 0.00022 * 10^-6 F = 220 * 10^-12 F = 220 pF
    • 1800 kilohms (1800 kÆ) = 1800 * 10^3 Æ = 1.8 * 10^6 Æ = 1.8 MÆ

    History of Metric Units

    • In 1954, the basic SI units (meter, kilogram, second, ampere, kelvin, and candela) were adopted by international agreement.
    • The mks (meter-kilogram-second) units are used for derived quantities and are the preferred units for nearly all scientific and engineering work.
    • The cgs system, based on the centimeter, gram, and second, is an older metric system that is still in use in some areas.

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    Description

    Practice converting quantities using metric prefixes, such as kilo, mega, and micro, in various units like voltage, ampere, and more.

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