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Questions and Answers
What is the unit of luminous intensity in S.I?
What is the unit of electric current in S.I?
What is the symbol for the unit of luminous intensity?
What is the symbol for the unit of electric current?
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What are the two physical quantities associated with the units mentioned?
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What does accuracy represent in the context of shooting?
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What is precision represented by in the context of shooting?
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What is the accepted value in the context of shooting?
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What does a tight grouping of shots indicate in the context of shooting?
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What is the difference between accuracy and precision in the context of shooting?
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What is the formula to calculate percentage error?
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What is accuracy determined by?
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What do AV and YV stand for in the percentage error formula?
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What is an analogy used to demonstrate accuracy and precision?
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What is the purpose of calculating percentage error?
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What is the formula to calculate the percentage error?
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What is the unit of the percentage error?
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What happens to the meter unit during the division in the percentage error formula?
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What is the value of AV in the given problem?
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What is the percentage error in the given problem?
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What is the conversion factor from inches to centimeters?
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When converting units, why can units be treated as algebraic quantities?
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What is the result of converting 15.0 in to centimeters?
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What is the advantage of treating units as algebraic quantities?
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Why is it important to know the correct conversion factor between units?
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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
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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.
