Thermal And Electrical Conductivity With Digital Sensor

Item Code: SK068

Principle and Working:

The heat conduction occurs due to the temperature difference between different locations of a body. In this setup a one-dimensional temperature gradient along a copper and aluminum rod is investigated. The quantity of heat dQ transported with time dt is a function of the cross-sectional area A and the temperature gradient dT/dx perpendicular to the surface.
... So dQ/dt = -λ A (dT/dx)
λ is the thermal conductivity of the substance.
The electrical conductivity of a metal (Copper & Aluminum) is determined by the resistance R of the
rod and its geometric dimensions (l=0.315 m, A = 4.91 x10 -4 m 2 )
σ = R.A/l
At room temperature T the conduction electrons in metal have a much greater mean free path than the phonons. For this reason heat conduction in metal is primarily due to the electrons. The relationship between the thermal conductivity λ and the electrical conductivity σ is established by the Wiedmann-Franz law:
λ/σ = L T
Where L is Lorenz number.




Features

  • Digital Weighing scales with maximum capacity of 5 kg or more.
  • PT-100 based digital thermometer with accuracy of 0.1 degree Celsius.
  • Test samples Like Copper and Aluminum with insulated cover.
  • Free data analyzing software.
  • DC Regulated power supply with safety sockets and dual temperature controlled exhaust fan.
  • Water heater with built-in steam generator.

  • To determine the heat capacity of the calorimeter.
  • To study the thermal conductivity of copper and aluminum at a constant temperature gradient.
  • To determine the electrical conductivity of aluminum and copper by plotting a current-voltage characteristic curve.
  • To verify the Wiedmann-Franz law and find out the Lorenz number

Digital timer & photogate:

  • Conductivity Rod : Cu/Al, size 420 x25.4mm (L x Φ),4mm current socket, 2 temperature point
  • Digital Temperature Sensor : Pt-100, Range -50 to +199.9 C, Resolution thermometer 0.1 C, Accuracy ± 0.2 C ± 1, digit, Battery 9V
  • Digital micro : Range 19.999 mV – 1000 V, accuracy 0.5% rgd + 3 dgt, resolution 0.001mV to 0.1mV
  • Power supply : Output Voltage 0-30V, Resolution 0.1V, Output Current 0-20 Amp, Resolution 0.1 Amp, Primary fuse 8 A
    • 1 Conductivity Cu & Al rod
    • 1 Lower Calorimeter Vessel
    • 1 Calorimeter Vessel with heater
    • 1 Laboratory jack
    • 1 Digital weighing balance
    • 2 Three finger clamp
    • 1 Support base & Support rod
    • 3 Digital temperature thermometer
    • 1 Power supply 0-30V, 20amp
    • 1 Micro voltmeter
    • 2 Connecting lead(Red & Black)
    • 1 Accessories: Glass beaker (500 ml)
    • 2 Heat conductive paste
    • 1 Laboratory gloves
    • 1 Vernier calliper
    • 1 Plastic beaker (2000ml)
    • 2 Bosshead
    • Nodes antinodes.
    • Tunning fork.
    • End correction.
    • First resonance length.
    • Second resonance length.
    • Resonance.
    • Velocity of sound with and without end correction.
    • Stationary waves.
    • Progressive waves.
    • Wave length.