If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.

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12kWh

18kWh

36kWh

6kWh

answer is B.

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Detailed Solution

Concept: We will use the energy power formula to calculate the appropriate quantity of electricity consumed by the iron over the course of a month because an electrical iron uses energy over a specific period of time. The purpose of the month of April is to obtain the designated number of days.
Formula used:
1 kW = 1000 W, 1 hour = 60 minutes, Energy=Power×time
Electrical energy is a type of electricity that is created by the unrestrained motion of electrons. We refer to a current flow within a circuit as occurring when these electrons are moving. Nowadays, we use electrical irons to iron our garments. We know that the electrical iron has a 1200 Watt rating, which is regarded to be power, based on the information that has been provided. As 1 kW = 1000 W. Time is equal to 30 minutes, and this is used each day for 30 minutes.
30 min×30 days. Since, 1 hour = 60 minutes so,
⇒Time=30 min×30 days⇒Time=30 min×1hr/60min×30 days⇒Time=1/2 hours×30 days⇒Time=15 hours
As we know that energy is the product of power and time so, we get
Energy=Power×time
⇒Energy=1.2kWh×15 hours
⇒Energy=1210kWh×15 hours
⇒Energy=6kWh×3 hours
⇒Energy=18kWh
Hence, the correct answer is option (2) .

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