Question

solve the numerical ​

Answer 1

Answer:

420 'units'

Explanation:

First let us convert all the powers into the commercial unit i.e. kW

1. 300 W = 300/1000 kW

                     = 0.3 kW

     2. 700 W = 700/1000 kW × 2 (As there are 2 of them)

                      =0.7×2 kW

                      = 1.4 kW

     3. 150 W = 150/1000 kW × 2 (As there are 2 of them)

                      = 0.15 kW × 2

                      = 0.3 kW

Sum of all the powers = 0.3 kW + 1.4 kW+0.3 kW

                                         = 2 kW

Therefore, power= work or energy/Time

So , Energy= Power × Time

                    = 2 kW × 7h

                    = 14 kWh

Energy in the month of November = 14 kWh × 30 days

                                                            =420 kWh

                                                            =420 'units'

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