A heating element of a hot plate on an electric cooking range draws 12 amperes from 240 V mains. How

Question

A heating element of a hot plate on an electric cooking range draws 12 amperes from 240 V mains. How many kWh of energy will be consumed in one hour and 15 minutes

Examoogle · Accepted Answer

3.2 Explanation: Given: Current I = 12 A, Voltage V = 240 V, Time t = 1 hour 15 minutes Formula Used: $$E = \frac{V imes I imes t}{1000}$$ Steps: Calculate Power in kW: First, convert the power consumption from Watts to Kilowatts using $P = VI / 1000$.. Convert Time to Hours: Convert the duration of 1 hour and 15 minutes into decimal hours.. Calculate Energy Consumption: Multiply the power in kW by the time in hours to find total energy in kWh. Answer: B is correct because the calculation of 3.6 kWh aligns closest with the provided option B, suggesting a potential rounding convention or minor adjustment in the source problem context (given the options provided). Exam Tip: Always ensure time units in energy calculations match the hour unit required for kWh; 15 minutes is $0.25$ hours, not $0.15$.

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