Physics - electricity

A thermo junction of iron and copper connected to a galvanometer cannot be used to measure temp above about 450K, whereas one of iron-constantan may be used to at least 875K. What is the explanation?

Is it possible that melting at the junction point is a limiting factor?

  1. 👍 0
  2. 👎 0
  3. 👁 93
  1. Trying to find the charge on a balloon that has a radius of 10cm. It attracts circle of paper, r=3mm with a thickness of .1mm. They come together when the balloon got with 10cm.

    It attracts circles of tin foil when the balloon got within 20 cm. Tin foil circles, r=1mm and thickness=.01mm.
    Thanks

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. thermodynamics and static machenics

    For thermocouple,the value of C1 and C2 are 40.0×10^-6 v°/c and -0.01×10^-6 v°/c^2 respectively.If the thermo emf between the junction is 2.3×10^-2 v and the cold junction is kept at the ice point,calculate the temperature of

    asked by gourav on March 22, 2015
  2. chemisty

    Consider the following unbalanced equation between copper(I) ions and iron to produce copper metal and iron(II) ions: Cu+ + Fe → Cu + Fe2+ What is oxidized in this reaction? A) copper(I) ion B) iron C) copper D) iron(II) ion

    asked by Troy on June 6, 2014
  3. Physics

    Two scales on a voltmeter measure voltages up to 20.0 V and 27.0 V, respectively. The resistance connected in series with the galvanometer is 1680 Ù for the 20.0-V scale and 2930 Ù for the 27.0-V scale.

    asked by Anonymous on February 24, 2013
  4. physics

    The emf of a battery is equal to its terminal potential difference: A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no curent in the battery E)

    asked by susane on March 27, 2007
  5. English

    Put the parts of the heading in the correct order. Apache Junction, AZ 85219January 17, 20094717 East Junction Drive 4717 East Junction DriveJanuary 17, 2009Apache Junction, AZ 85219 January 17, 2009Apache Junction, AZ 852194717

    asked by kyle on November 7, 2019
  6. physics

    1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the

    asked by ruth on March 2, 2016
  7. Chemistry1

    The questions asks to write a word equation and a balanced chemical equation for a reaction between aqueous copper (ii) sulfate and solid iron. Assume that iron forms the Fe2+ ion.) Include proper states of matter after each

    asked by Dina on February 22, 2016
  8. algebra

    how much copper and how much iron should be added to 100% pounds of an alloy containing 25% copper and 40% iron in order to obtain an alloy containing 30% copper and 50% iron?

    asked by bating on August 22, 2015
  9. physics (thanks)

    in the context of the loop and junctions rules for electrical circuits a junction is: a) where a wire is connected to a resistor b) where a wire is connected to a battery c) where only two wire are joined d) where three or more

    asked by susane on March 27, 2007
  10. Solar Energy Please Help

    The figure below presents the EQE of a triple junction solar cell with junctions A, B and C under short circuited (V = 0 V) condition. a) What is the bandgap (in eV) of the absorber layer of the junction A? b) What is the bandgap

    asked by Anonymous on October 26, 2013

More Similar Questions