6. DETAILS OSCOLPHYS2016 20.5.P.082. MY NOTES PRACTICE ANOTHER Nichrome wire is used in some radiative heaters. (a) Find the resistance (in Q) needed if the average power output is to be 1.25 kW utilizing 120 V AC. Ω (b) What length (in m) of Nichrome wire, having a cross-sectional area of 5.15 mm2, is needed if the operating temperature is 500°C? (c) What power (in kW) will it draw when first switched on? kW

6. DETAILS OSCOLPHYS2016 20.5.P.082. MY NOTES PRACTICE ANOTHER Nichrome wire is used in some radiative heaters. (a) Find the resistance (in Q) needed if the average power output is to be 1.25 kW utilizing 120 V AC. Ω (b) What length (in m) of Nichrome wire, having a cross-sectional area of 5.15 mm2, is needed if the operating temperature is 500°C? (c) What power (in kW) will it draw when first switched on? kW

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 70PE: Unreasonable Results (a) What current is needed to transmit 1.00 102 MW of power at 10.0kV? (b)...

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Using your understanding of the nature of internal energy and temperature, explain why we might expect the resistance of a solid to increase if its temperature increases.
Unreasonable Results (a) To what temperature must you raise a resistor made of constantan to double its resistance, assuming a constant temperature coefficient of resistivity? (b) To cut it in half? (c) What is unreasonable about these results? (d) Which assumptions are unreasonable, or which premises are inconsistent?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
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b. A 60-volts potential difference is applied to the circuit below. i. Find the equivalent resistance of the circuit, ii. The current in the circuit, iii. The current in the 10-ohm resistor. 40 BOV 140 100 c. Calculate the resistance per unit length of a 22-gauge Nichrome wire of radius 0.321 mm.
3. A 12-V battery and a 12-ohm resistor are connected as shown in circuit X below. Two 12-ohm resistors are connected as shown in circuit Y. The current in the battery in circuit X is Circult X Circuit Y that in the battery in circuit 25 ZI Hint : Use I = V-R a. 1/3 b. 2 C. the same as Explain A ZI
A piece of wire of length 31.5 cm and cross-sectional area 227.4 cm² is made into a resistor of resistance 713.8 ohm. What is the resistivity of the material used to create the resistor? O a. 5113020.78 ohm-metre O b. 10.04 ohm-metre O c. 5152.96 ohm-metre d. 98.88 ohm-metre Oe. 51.53 ohm-metre Of. 515295.62 ohm-metre O g. 0.10 ohm-metre Oh. 0.99 ohm-metre
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