SK068 Thermal And Electrical Conductivity With Digital Sensor

Thermal And Electrical Conductivity With Digital Sensor 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. Objectives: 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 Technical Data: 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 Scope of Delivery: 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