A piece of Nichrome wire has a radius of 6.5 x 10^-4 m. It is used in a laboratory to make a heater that dissipates 6.00 x 10^2 W of power when connected to a voltage source of 120 V. Ignoring the effect of temperature on resistance, estimate the necessary length of wire.
2007-09-11 08:14:52 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
There are different types of NiChrome wire. Resistivities vary between 102 microOhm-cm and 112 microOhm-cm at 25C for circular wire.
Using an average of 108 microOhm-cm divided by a diameter of 0.13 cm, that's 14 microOhms per cm.
To get 600 Watts at 120V the resistance must be 0.041666 Ohms, or 41,666.6 microOhms.
The total length, then, is 2976 cm or ~30 m.
.
2007-09-11 09:27:15 · answer #1 · answered by tlbs101 7 · 0⤊ 1⤋
Don't cheat.
Do your own homework.
2007-09-11 09:33:48 · answer #2 · answered by dmb06851 7 · 1⤊ 11⤋