A platinum resistance thermometer wire has a resistance of 70hms at 0°Cand 7.5 Ohms at 100°C. Calculate the temperature of the wire when the resistance is 7...

Assessment: JAMB UTME - Physics - 2015 Subject: Physics

Question 1 Report

A platinum resistance thermometer wire has a resistance of 70hms at 0°Cand 7.5 Ohms at 100°C. Calculate the temperature of the wire when the resistance is 7.2 Ohms
Answer Details
R0 = 7Ω , R1 = 7.2 Ω, R2 = 7.5 Ω, Tx = ?

[(X – T100°C) ÷ (R1 - R0)] = [(T100°C – T0°C) ÷ (R2 - R0)]

[(Tx – 0) ÷ (72 – 7)] = [(100 – 0) ÷ (7.5 – 7)]

Tx/0.2 = (100 ÷ 0.5)

Tx = [(0.2 × 100)] ÷ 0.5

= 20/0.5 = 40°C

Read lesson note on Temperature And Its Measurement (JAMB)
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