A pocket calculator draws 0.40 A of current when connected to a 6.0 V battery. At what rate does the calculator use electrical energy? (b) An electric heater is to provide 14 kW of power when connected to a 120 V potential difference. What should the resistance of the heater be when turned on?

A pocket calculator draws 0.40 A of current when connected to a 6.0 V battery. At what rate does the calculator use electrical energy? (b) An electric heater is to provide 14 kW of power when connected to a 120 V potential difference. What should the resistance of the heater be when turned on?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 57PQ

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Question

(a) A pocket calculator draws 0.40 A of current when connected to a 6.0 V battery. At what
rate does the calculator use electrical energy? (b) An electric heater is to provide 14 kW of
power when connected to a 120 V potential difference. What should the resistance of the
heater be when turned on?

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