Exam CEM Topic 1 Question 5 Discussion

Actual exam question for AEE's CEM exam
Question #: 5
Topic #: 1
Electricity costs SO. 10 per kWh. if an electric water heater has an efficiency of 95*6. what is the equivalent price of natural gas per Gigajoule for a natural gas water heater? The natural gas water heater has an efficiency of 95*t based on lower-heating value.
[Natural gas has an energy content of 36.400 K|/m3 (higher-heating value) and 32-760 K/m3 (lower-heating value).] SELECT THE CORRECT ANSWER

Suggested Answer: B Vote an answer

To determine the equivalent price of natural gas per gigajoule (GJ) for a natural gas water heater, we compare the cost of electricity and natural gas on an energy-equivalent basis.
Step 1: Convert Electricity Cost to Cost per GJ
* Electricity cost:$0.10/kWh
* 1 GJ =277.8 kWh
A table with numbers and equations AI-generated content may be incorrect.

by Maxwell at Jul 11, 2026, 10:12 PM

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