SI Units of Luminous Intensity and Electric Current
25 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the unit of luminous intensity in S.I?

  • coulomb
  • ampere
  • ampere-hour
  • candela (correct)

    • What is the unit of electric current in S.I?

  • ohm
  • volt
  • ampere (correct)
  • watt

    • What is the symbol for the unit of luminous intensity?

  • C
  • cd (correct)
  • A
  • I

    • What is the symbol for the unit of electric current?

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

    What are the two physical quantities associated with the units mentioned?

    <p>Electric current and luminous intensity</p> Signup and view all the answers

    What does accuracy represent in the context of shooting?

    <p>Hitting the bull's eye</p> Signup and view all the answers

    What is precision represented by in the context of shooting?

    <p>A tight grouping of shots</p> Signup and view all the answers

    What is the accepted value in the context of shooting?

    <p>The bull's eye</p> Signup and view all the answers

    What does a tight grouping of shots indicate in the context of shooting?

    <p>High precision</p> Signup and view all the answers

    What is the difference between accuracy and precision in the context of shooting?

    <p>Accuracy is hitting the bull's eye, precision is a tight grouping of shots</p> Signup and view all the answers

    What is the formula to calculate percentage error?

    <p>% Error = (YV - AV) x 100 ÷ AV</p> Signup and view all the answers

    What is accuracy determined by?

    <p>The number of significant digits</p> Signup and view all the answers

    What do AV and YV stand for in the percentage error formula?

    <p>Your Value and Accepted Value</p> Signup and view all the answers

    What is an analogy used to demonstrate accuracy and precision?

    <p>Shooting at a target</p> Signup and view all the answers

    What is the purpose of calculating percentage error?

    <p>To compare the measured value to the accepted value</p> Signup and view all the answers

    What is the formula to calculate the percentage error?

    <p>(YV - AV) x 100 ÷ AV</p> Signup and view all the answers

    What is the unit of the percentage error?

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

    What happens to the meter unit during the division in the percentage error formula?

    <p>It cancels out</p> Signup and view all the answers

    What is the value of AV in the given problem?

    <p>9.45 m</p> Signup and view all the answers

    What is the percentage error in the given problem?

    <p>10.5 %</p> Signup and view all the answers

    What is the conversion factor from inches to centimeters?

    <p>1 in = 2.54 cm</p> Signup and view all the answers

    When converting units, why can units be treated as algebraic quantities?

    <p>Because units can be cancelled</p> Signup and view all the answers

    What is the result of converting 15.0 in to centimeters?

    <p>38.1 cm</p> Signup and view all the answers

    What is the advantage of treating units as algebraic quantities?

    <p>It allows for unit cancellation</p> Signup and view all the answers

    Why is it important to know the correct conversion factor between units?

    <p>So that accurate results can be obtained</p> Signup and view all the answers

    Study Notes

    Units and Measurements

    • The unit of luminous intensity is the candela (cd).
    • The unit of electric current is the ampere (A).

    S.I. Accuracy

    • Determined by the number of significant digits.
    • Calculated by the formula: % Error = (YV – AV) x 100 ÷ AV

    Accuracy and Precision

    • Demonstrated by shooting at a target:
      • Accuracy: hitting the bull's eye (the accepted value)
      • Precision: a tight grouping of shots (they are finely tuned)

    Calculating Percentage Error

    • Formula: % Error = (YV – AV) x 100 ÷ AV
    • Where: YV is the student's measured value, AV is the accepted value
    • Example:
      • YV = 8.46 m, AV = 9.45 m
      • % Error = (8.46 m – 9.45 m) x 100 ÷ 9.45 m = -10.5%

    Unit Conversion

    • Units can be treated as algebraic quantities that can cancel each other.
    • Example: converting 15.0 in to centimeters:
      • 1 in = 2.54 cm

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers the SI units of luminous intensity and electric current, including candela and ampere. Test your understanding of these fundamental units in physics.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser