Name and define the SI unit of power. Give the bigger power units of power.

Solution

The SI unit of power is watt (W).

The power of a body is one watt if it does work at the rate of 1 joule per second.

Also, power is 1 watt when the rate of consumption of energy is 1 Js^-1.

1 watt = $\frac{1 J o u l e}{1 s e c o n d}$

Bigger units of power are kilowatt, megawatt and horse power.

1 kilowatt = 1000 watt;
1 kW = 1000 W

1 megawatt = 10⁶ watt;
1 MW = 10⁶ W

1 horse power = 746 watt;
1 H.P. = 746 W.

Some More Questions From Matter In Our Surroundings Chapter

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Matter In Our Surroundings

Name and define the SI unit of power. Give the bigger power units of power.

Some More Questions From Matter In Our Surroundings Chapter

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 ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process

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For Daily Free Study Material Join wiredfaculty

Matter In Our Surroundings

Name and define the SI unit of power. Give the bigger power units of power.

Some More Questions From Matter In Our Surroundings Chapter

Give reason for the following observations.We can get the smell of perfume sitting several metres away.

What is the physical state of water ata) 25°C b)00Cc)1000C

What is the physical state of water at0°C

What is the physical state of water at100°C

Give two reasons to justifyWater at room temperature is a liquid.

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

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

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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.