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Bell ringer: Now I Know……..

Bell ringer: Now I Know……. What did you learn about electrical work in the last class?? On page 65 fill in the blanks using complete sentences/thoughts. Now I know That ________________ That ________________ That ________________ I still want to know ________________________.

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Bell ringer: Now I Know……..

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  1. Bell ringer: Now I Know…….. What did you learn about electrical work in the last class?? On page 65 fill in the blanks using complete sentences/thoughts. Now I know That ________________ That ________________ That ________________ I still want to know ________________________. I am glad that I learned that__________________ because__________________________________.

  2. Measuring Work Done by an Electric Motor Lab 2.3A Page 68

  3. 68 Page ___  Lab 2.3A: Measuring Work Done by an Electric Motor • Objectives: • Determine the work input to an electric motor • Determine the work output of an electric motor • Determine the efficiency of the motor (Compare the work output of an electrical motor to the work input to the motor) • Lab Proficiencies: • Set up a system to measure work input to an electric motor as it lifts a load • Set up and perform an experiment to measure the work done by an electric motor while lifting a load • Measure the voltage across and current through a motor • Devise a method to measure constant speed when lifting a hanger and mass

  4. Page ____ continued  • Materials: • DC Motor • Power Supply • Meter Stick • Single Pulley with Bracket • Small Weight Hanger • Universal Lead Set • Long Crossbar • Rod Connectors, 3 • 5/64 “ Allen Wrench • Stop Watch • Spool Pulley • Nylon Cord • Hook • Small Slotted Weight Set • S-Hook • Mechanical Breadboard • Support Rod with Base, 2

  5. When you get in your lab groups… • Bring your notebook, pencil, and calculator (if you brought it). • Assign roles and write your group members and their roles on the bottom first page of your lab data sheet. • Send your Materials Manager to collect safety glasses (sanitized) and a calculator for your group. • Have your Head Physicist read the Discussion to everyone. Head Physicist makes sure everyone understands the concepts before proceeding with the lab. • Wear your safety glasses AT ALL TIMES and begin. • Lab Instructions will be on your lab table. • Submit 2.3A Data Sheet today.

  6. Read the Instructions and PAY ATTENTION!! • When I walk by I want to hear the HEAD PHYSICISTS reading the discussion and procedures out loud to the rest of the group. • SAFETY WARNINGS! • There are moving parts in this lab!! • All hair should be tied back, loose clothing properly taken care of and hanging objects tucked or removed. • Safety goggles should be worn at all times because flying objects are a possibility. • Turn the current knob SLOWLY!!!!!!!!!!!!!!!!!!!!!! • Materials Manager will spot the lifted load AT ALL TIMES. I don’t want to hear any weights hit the floor or walls!! • ABSOLUTELY NO HORSEPLAY WILL BE TOLERATED!! We are dealing with electricity, a motor and weights which all can equal a disaster if not paying attention!!! • BE ALERT OR YOU WILL GET HURT!

  7. Lab 2.3A:Data, Procedure and Conclusion Exit Slip Homework: • Turn in your lab 2.3A Data Sheet before you leave. • You must finish ALL the data and questions before you leave!!! • Finish your Lab write up in your notebook • It will be checked/stamped next time. • It goes on page 67.

  8. 67 Page __: Lab 2.1AData, Procedure, and Conclusion • Procedure • At least 6 numbered steps • Should be easy to follow • May use diagrams • Conclusion: • Did you meet your objective? Why or why not? • What possible sources of error could have affected your data? • What did you learn from this lab? • How was your group able to rely on your in your assigned role?

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