Question

A household consumes 35 units of electrical energy. How many joules of energy is

. this? ​

Answer 1

Explanation:

Energy consumed by certain households in a month E=250 units =250 kWh

∴E=250×3.6×10

6

J (∵1kWh=3.6×10

6

J)

⟹E=9×10

8

Joules

Answer 2

Explanation:

The commercial unit of energy is kilo-Watt-hour (kWh)

it is used in daily life because SI unit 'joule' is too small to express very large quantities of energy.

1 kWh in joule :

1kWh=1kW×1h

=1000W×1h

=1000J/s¹×3600s

1kWh=3600000J

1kWh=3.6×10⁶J

so, 35Kwh = 35× 3.6×10⁶ J

= 126 × 10⁶ J