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Precision Portable

January 10th, 2010 Leave a comment Go to comments

Precision Portable
Electricity?

U guys can help me. How you 20  C (original) increase in copper wire when its temperature increases 20% resist? Precision aluminum wire length of 10.00 V power supply And 0.4212 here exactly 20  C. Is measured is connected to wires Are placed in a new environment where the temperature of the unknown in the current A. What is the unknown temperature of 0.3618? Why 9.0 V Portable Cassette The measured maximum power consumption of the player that draws 350 mA of current Current up to?

The temperature coefficient of resistance for copper 0.0039 1 / º C. Resistance R (T) is eit = R (20 º C) in the * [1 + ΔT * 0.0039] 20 º C 20% of the If you increase the R (20 º C) in * (1 +0.2), so that ΔT * 0.0039 = 0.2, ΔT = 51.28 º C aluminum The initial resistance of the wire omyimyeo 10.00/0.4212 = 23.74, in the 20 º C, R = 10.00/0.3618 = 27.64 ohms is in the new environment. ΔR = 3.9 ohms. From the above equation R (T) a = R (20 º C) in * (1 + ΔT * K). Al, K = 0.0039, so R (T) a = R (20 º C) in * (1 + ΔT * 0.0039) 27.64 = 23.74 * (1 + ΔT * 0.0039) 1.164 = 1 + ΔT * 0.0039 0.164 = 0.0039 * ΔT ΔT = 42.12 º C temperature of 20 º C, plus it's new or 62.12 º C power = voltage * current, 9.0 * 0.350 = 3.15W

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