Question

A certaio household has consumed 250
units of every during a month. How
much energy is the in Joules?​

Answer 1

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Given:

Household consumes 250 units of energy in a month

To find:

Energy in joules = ?

Explanation:

Remember: 1 unit of energy is equal to 1 kilowatt hour which is represented as kWh

Thus, 250 units = 250 kWh

1 kilowatt hour = 3.6 × 10^6 Joule

(10 raise to 6)

Energy in joules = 250 × 3.6 × 10 ^6

Energy in joules = 900 × 10^6

= 9 × 10^8 J

Note: Here we multiply 3.6 × 10^6 with 250 to convert it into joule.

Answer:

Thus, Energy in joules is 9 × 10^8 J

Additional points:

• SI unit of energy is joule. 1 calorie = 4.18 Joules
• 1 kWh = 1 × 60 × 60 × 1000 = 3600000 = 3.6 × 10^6 J [ As 1 hour = 60 min × 60 sec]
• 1 joule = 1 watt per second
• Energy = Power × Time
• Solve more such questions to get good hold on it