Question

a lamp consumes 1000 j of electrical energy in 10 s what is power if this lamp is used for 8 hours daily then calculate total energy consumed for the month of April​

Answer 1

Explanation:

power =E/t = 1000/10= 100j

Energy consumed per day= Pxt= 100x8x3600= 2880000j

total energy con. in april= 2880000x30= 86400000j

Answer 2

Total energy consumed for the month of April​ is 57600 J.

Explanation:

Electrical energy consumed by a lamp is 1000 J in 10 seconds. The power delivered by the lamp is given by energy consumed per unit time. It is given by :

$P=\dfrac{E}{t}\\\\P=\dfrac{1000}{10}\\\\P=100\ W\\\\P=0.1\ kW$

For 8 hours, the power delivered is :

$P=0.1\ kW\times 8\\\\P=80\ kWh$

There are 30 days in April or 720 hours. Energy consumed for the month of April​ is given by :

$E=P\times t\\\\E=80\times 720\\\\E=57600\ J$

So, total energy consumed for the month of April​ is 57600 J.

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