A 200-L Electric Water Heater Uses 2 $23 ^ { \circ } \mathrm { C } \text { to } 75 ^ { \circ } \mathrm { C } \text { ? }$

question 9

Multiple Choice

A 200-L electric water heater uses 2.0 kW. Assuming no heat loss, how many hours would it take to heat the water in this tank from $23 ^ { \circ } \mathrm { C } \text { to } 75 ^ { \circ } \mathrm { C } \text { ? }$ The specific heat of water is $4186 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K }$ and its density is $1000 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

• A) 6.0 hours
• B) 5.0 . hours
• C) 7.0 hours
• D) 8.0 hours

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Definitions:

Job Order Cost System

An accounting method that assigns costs to specific production batches or jobs, trackable by individual orders.

General Cost System

An accounting system that is used to track and allocate the general expenses of a company.

Process Cost System

An accounting system used to accumulate costs in industries where a homogeneous product is produced continuously in a mass production environment.

Predetermined Overhead Rate

A rate used to assign manufacturing overhead costs to products or job orders, calculated before the costs are incurred, based on estimated overhead and activity levels.