(a) How many hours does it take a 40 W electric light bulb to consume energy worth 2500 ID ( Iraqi Dinar), if the cost of electrical energy is 125 ID/kWh?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter2: Basic Electricity
Section: Chapter Questions
Problem 34RQ: What is the Btu/hour output of an electric heater rated at 15 kilowatts? a. 51.15 Btu/hour b. 51,150...
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(a) How many hours does it take a 40 W electric light bulb to consume energy
worth 2500 ID ( Iraqi Dinar), if the cost of electrical energy is 125 ID/kWh?
(b) A 9 V battery with charge capacity of 129 mAh (milli Ampere hour) is used in
a transistor radio, with average current of 20 mA. How many Joules of energy can
this battery supply?
Transcribed Image Text:(a) How many hours does it take a 40 W electric light bulb to consume energy worth 2500 ID ( Iraqi Dinar), if the cost of electrical energy is 125 ID/kWh? (b) A 9 V battery with charge capacity of 129 mAh (milli Ampere hour) is used in a transistor radio, with average current of 20 mA. How many Joules of energy can this battery supply?
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