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Experimental report of design experiment for measuring resistivity of Fe Cr Al wire 1. Comparative method 2. Derivation and calculation of resistivity expression and relative uncertainty expression requirements
Four terminal connection method
Connect the 220 V 800 w electric furnace into the circuit and discharge it after 10 minutes of normal operation_____ The heat of J
Q=W=Pt=800w*10min=8000J
There is a 30 ohm resistor. Connect it to a 6V power supply. When it is powered on for one minute, what is the work done by the current passing through the resistor? What is the power consumption?
The work done on the resistance = Tu & # 178; / r = 60 × 6 & # 178; △ 30 = 72 joules
Because it is a pure resistance circuit, the power consumed = the work done on the resistance (heating) = 72 joules
Resistance 2 ohm, 1 how much heat does the current produce in 1 minute
Heat = I ^ 2rt = 1 ^ 2 * 2 * 60 = 120 joules
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