WarmUp

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Warm-Up

• Directions Circle the largest unit
• 1. liter or kiloliter
• 2. cubic meter or liter
• 3. milliliter or cubic centimeter
• 4. square centimeter or square millimeter
• 1. kilometer
• 2. cubic meter
• 3. Tricky! They are the same.
• 4. square centimeter

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Homework Answers p. 127 2-50 even

• 48. 2.5 km²
• 50. 1000 kg

• 2. kL
• 4. m³
• 6. cm²
• 8. 0.001
• 10. 0.001
• 12. 100
• 14. 1
• 16. mL

• 18. ha
• 20. cm³
• 22. L
• 24. cm²
• 26. L
• 28. mL
• 30. ha
• 32. m³

• 34. m³
• 36. m²
• 38. L
• 40. 600 mL
• 42. 0.450 cm
• 44. 0.650 m³
• 46. 180,000 cm²

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Tech Math 1

• Day 15
• 3.5 Time, Current, and Other Units
• 3.6 Temperature

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SI Time and Current Units

• Time
• Main unit - seconds s
• Minutes - min
• hour - h
• Current
• Main unit - ampere A
• Milliamps mA
• Microamps - µA

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Other Electrical Units p. 130 Table 3.4

• Volt V voltage
• Ohm O resistance
• Hertz Hz frequency
• Farad F capacitance
• Henry H inductance
• Coulomb C charge

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Time Examples

• Ex. 1 Convert the following units below
• 3 hr. 17 min. ______s
• Unit Cancellation Method

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Proportion Method
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Time Examples

• Ex. 2 S.P. Convert the following units below
• 3 years ______s
• Unit Cancellation Method

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Current Examples

• Ex. 3 Convert the following units below
• 45 mA _______A
• Unit Cancellation Method

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Proportion Method
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Current Examples

• Ex. 4 S.P. Convert the following units below
• 2.7A _______mA
• Unit Cancellation Method

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Temperature

• SI unit is K Kelvin
• based on the theory that at absolute 0 degrees K,
  all matter would stop moving
• Scientists have gotten close
• Mainly used in scientific and engineering work
• Everyday temperatures C - Celsius
• US temperature unit F - Fahrenheit

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Current Examples

• Ex. 5 Convert 65F to Celsius

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Current Examples

• Ex. 6 S.P. Convert -18 C to Fahrenheit

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Current Examples

• Ex. 7 S.P. The average temperature in the SUMMER
  in Antarctica is -15to -35 C. What is the
  temperature range in Fahrenheit?

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Which sounds more reasonable?

• It was 42 C/F on the Fourth of July last year!
• Water begins to boil at 212C/F.
• Bake the cake at 350C/F in the oven for 30
  minutes.
• It was so cold yesterday! It was 3C/F yesterday
  in Jacksonville, NC.

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Questions
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Work Time

• p. 130 1-30 even
• p. 132 1-20 all