Dual Tone DC Ohm's Law Wall Clock

Normal Retail: $59.95 Includes Shipping

 

 

• Vibrant color combinations  and crafted for years of use!
• The most complete information available for all the Ohm's law formulas!
• Uniquely functional - it's worth every penny!
• Resistor bands color chart (see our TechNotes page to the left for more info)
• Ohm's law for AC and/or DC applications
• High quality products - will give you excellent service
• All products include quality quartz movement, sweep seconds hand and battery.
• 30 day guarantee, one year warranty
• Water resistant to light sprinkling
• Over 20 products to choose from
• Shipping generally within 24 hours!
• Watches are packaged in silver tins or black velvet pouches. Additional gift wrapping at no additonal charge. 
• In most cases can be taken as a tax deduction

Feedback about this product:

"The clock arrived with this mornings mail.  It not only looks terrific, it arrived running and set to the correct Eastern Standard Time.  The faculty I've shown it to are quite pleased with it.  It's installed in our  sophomore and junior Circuit Design teaching lab where I'm sure it will be a worthwhile teaching aid."
W. Mutch, Cornell University, School of Electrical & Computer Engineering, Ithaca, NY

"Thank you very much!  Our new clock will be a valuable tool used in our avionics shop."
-AT2 C. Hodsdon, Aviation Intermediate Maintenance Department, Avionics Shop 9, U.S.S. Harry S. Truman

I "love the clocks! They are hanging in our high school electronics lab and the students find them to be a handy reference. Thanks again!"  J. Crotts, C.E.T. SR Bucks County Technical School, Fairless Hills, PA

"Received the clock today.  Looks great!  Thanks again." C. Fischer, Topeka KS

"I’m enjoying my clock. It’s unique and is a good fit in my home office." ...D. Gamel, Texas Tech University, Lubbock, TX

Who was James Joule and what did he contribute to electricity?

James Prescott Joule (December 24, 1818–October 11, 1889) was an English physicist, born in Salford, near Manchester. Joule was one of the outstanding physicists of his day. Joule is best known for his research in electricity and thermodynamics.

In the course of his investigations of the heat emitted in an electrical circuit, he formulated the law, now known as Joule's law, of electric heating, which states that the amount of heat produced each second in a conductor by a current of electricity is proportional to the resistance of the conductor and to the square of the current. Joule experimentally verified the law of conservation of energy in his study of the transfer of mechanical energy into heat energy.

Using many independent methods, Joule determined the numerical relation between heat and mechanical energy, or the mechanical equivalent of heat. The unit (SI) of energy called the joule is named after him. (it is equal to 1 watt-second, or 10 million ergs) and is pronounced to rhyme with "tool."

Together with the physicist William Thomson (later Baron Kelvin), Joule found that the temperature of a gas falls when it expands without doing any work. This principle, which became known as the Joule-Thomson effect, underlies the operation of common refrigeration and air conditioning systems.

Joule received many honors from universities and scientific societies throughout the world. His Scientific Papers (2 vol.) were published in 1885 and 1887.

Joule died at home in Sale and is buried in the Brooklands cemetery there. The gravestone is inscribed with the number "772.55", his climacteric 1878 measurement of the mechanical equivalent of heat, and with a quotation from the Gospel of John, "I must work the works of him that sent me, while it is day: the night cometh, when no man can work" (9:4).

• Fellow of the Royal Society, (1850);
  • Royal Medal, (1852);
  • Copley Medal (1870);
• President of Manchester Literary and Philosophical Society, (1860);
• President of the British Association for the Advancement of Science, (1872);
• Honorary degrees:
  • LL.D., Trinity College Dublin, (1857);
  • DCL, University of Oxford, (1860);
  • LL.D., University of Edinburgh, (1871).
• He received a civil list pension of £200 per annum in 1878 for services to science;
• Albert Medal of the Royal Society of Arts, (1880).
• There is a memorial to Joule in the north choir aisle of Westminster Abbey, though he is not buried there as many biographies erroneously state.
• A statue by Alfred Gilbert, stands in Manchester Town Hall, opposite that of Dalton.