Estimate the length of the wire required to get a resistance, Electrical Engineering

A heater element is made of nichrome wire having resistivity equal to 100 × 10-8 ohm-m. The diameter of the wire is 0.4mm. Calculate the length of the wire required to get a resistance of 40 ?.

Ans:

When the heater element is Nichrome ρ = 100x 10-8 ?-m.

a = (π/4) (0.4 x10-3)2 m2

a = 12.6 x 10-3 m2

R = 40?

R = ρ (l/a) = 40 = (100 x 10-8 x l)/(12.6 x 10-3)

l = 5 m.

Posted Date: 5/21/2013 6:07:18 AM | Location : United States







Related Discussions:- Estimate the length of the wire required to get a resistance, Assignment Help, Ask Question on Estimate the length of the wire required to get a resistance, Get Answer, Expert's Help, Estimate the length of the wire required to get a resistance Discussions

Write discussion on Estimate the length of the wire required to get a resistance
Your posts are moderated
Related Questions
Question: a) For the circuits shown in figure a and in figure b, show the output voltage waveform V0(t) if a sinusoidal signal with peak value of 5V is applied and the dc suppl


Voltage is referred as Potential difference among two points. Potential means its force. I think so.voltage defination is 100% correct.

Q. What is the need of MODEM in data communication? Need of Modem: Modems are used to interface computers, computer networks in addition to other terminal equipment to teleco

Semiconductor  in Equilibrium Equilibrium in semiconductors implies the following: (i) Steady state: ∂Z / ∂t = 0 In which Z is any physical quantity like charge, volt

To design a VI that can be used to show how the voltage falls across a resistor in a simple CR circuit when excited by a step function. The title of the VI will be Capacitor Res

Q. Explain working of Single-Phase Induction Motors? For reasons of simplicity and cost, a single-phase power supply is universally preferred for fractional-horsepower motors.

In the circuit above, V1 is a dc supply which outputs 12V, R1 has a value of 100 Ω and C1 is 100µF. The switch has been left in the position shown for a long time such that there i

Q. An inverting amplifier is designed with three inputs, v 1 , v 2 , and v 3 , as shown in Figure. Determine the output voltage. Then indicate how the circuit may be modified to pe

Q. Write a short note on RS-232-C. Ans: RS-232 standard is a collection of connection standards between different pieces of equipment. EIA RS-232 serial communication standard