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Matter In Our Surroundings

Question
CBSEENSC9006395
Wired Faculty App

An electric bulb of 60 W is used for 6 h per day. Calculate the units of energy consumed in one day by the bulb.

Solution
Given, 

Power of the bulb, P = 60 W = 601000  kW = 0.06 kW

Time taken, t = 6 hrs

Therefore, 

Energy consumed per day  = P × t 

                                         = 0.6 x 6 = 0.36 kWh
                                         = 0.36 units 

Some More Questions From Matter In Our Surroundings Chapter

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

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