7. An electric water heater has a rating of 1 Kw, 230 v. The coil used as the heating element is 10m long and has a resistivity of 1.724 x 10-6 ohm - cm. Determine the required diameter of the wire in mils? A. 2.43 mils В. 2.52 mils C. 3.21 mils D. 1.35 mils 8. A carbon resistor dissipates 60 W of power from a 120 V source at 20°C. How much power will be dissipated in the resistor at 120°C if connected across the same source? Assume the temperature coefficient of carbon at 20°C is -0.0005 per °C A. 61. 50 W B. 65.21 W C. 62.34 W D. 63.16 W 9. What is the total resistance of eleven 33kn resistors connected in parallel? A. 33 ko В. З кQ C. 363 kQ D. 11 kQ

7. An electric water heater has a rating of 1 Kw, 230 v. The coil used as the heating element is 10m long and has a resistivity of 1.724 x 10-6 ohm - cm. Determine the required diameter of the wire in mils? A. 2.43 mils В. 2.52 mils C. 3.21 mils D. 1.35 mils 8. A carbon resistor dissipates 60 W of power from a 120 V source at 20°C. How much power will be dissipated in the resistor at 120°C if connected across the same source? Assume the temperature coefficient of carbon at 20°C is -0.0005 per °C A. 61. 50 W B. 65.21 W C. 62.34 W D. 63.16 W 9. What is the total resistance of eleven 33kn resistors connected in parallel? A. 33 ko В. З кQ C. 363 kQ D. 11 kQ

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.7MCQ: Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a)...

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Question

100%

7. An electric water heater has a rating of 1 Kw, 230 v. The coil used as the heating
element is 10m long and has a resistivity of 1.724 x 10-6 ohm – cm. Determine the
required diameter of the wire in mils?
A. 2.43 mils
В. 2.52 mils
C. 3.21 mils
D. 1.35 mils
8. A carbon resistor dissipates 60 W of power from a 120 V source at 20°C. How much
power will be dissipated in the resistor at 120°C if connected across the same source?
Assume the temperature coefficient of carbon at 20°C is -0.0005 per °C
В. 65.21 W
C. 62.34 W
A. 61. 50 W
D. 63.16 W
9. What is the total resistance of eleven 33kn resistors connected in parallel?
А. 33 kQ
В. З кО
C. 363 kQ
D. 11 ko

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