Question

Lamp has power rating of 100 w and is used with a 230 v supply calculate electrical energy supplied to the lamp in half an hour

Answer 1

Answer:

i don't know it's out of my syllabus

Answer 2

Electrical energy supplied to the lamp in half an hour is 50 W h or 0.05 kw h

Explanation:

• Electric energy is given as product of power of the appliance and the time for which electric supply in provided to the appliance
• Electric energy is given as

                Energy = Power * time taken

• Electric energy is the consumption of electricity of any given time period to any appliance

• Its SI unit for house hold is kW h and for industries it is horse power hp [ 1 horse power is approximately given as 746 watt or 0.746 kilowatt]

Given, Power = 100 W

Voltage = 230 V

Time = 30 min or $\frac{1}{2}$ hr

=> Energy = 100 * $\frac{1}{2}$

=> Energy = 50 W h

For kilowatt hour

=> Energy = $\frac{50}{1000}$

=> Energy = 0.050 kW h

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