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unit

Power

Definition

The power is the physical measure, which defines the ratio between work and the time in which this work is accomplished.

1 watt is equal to the power, which during 1 second performs the mechanical work of 1 joule.

 

system of units:   SI;
statute:   derived unit (with special name);
name the value:   P;
unit name:   watt;
symbol unit:   W;
relationship of definition:   P = E/τ;
dimension:   M L2 T-2;
expression in other units:   ft·lbf/h, Hp;

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Units of measurement

namesymbol value in SI unit:
W
note
1 joule per hourJ/h≈ 2.(7) × 10-4 
1 joule per minuteJ/min≈ 0.01(6) 
1 joule per secondJ/s= 1 
1 foot pound-force per hourft lbf/h≈ 3.766 161 × 10-4 
1 foot pound-force per minutft lbf/min≈ 0.022 596 
1 foot pound-force per secondft lbf/s≈ 1.355 818 
1 horsepowerHp≈ 745.699(9)(1)
1 horsepowerHpth≈ 9 809.50(2)
1 horsepowerHpel= 746(3)
1 horsepowerHpm≈ 735.498 8(4)
1 horsepowerHpUK≈ 745.70(5)
1 horsepowerHpH2O≈ 746.043(6)
1 erg per seconderg/s= 1.0 
1 gram-force metre per secondgf m/s≈ 9.81 
for thermodynamic
1 BtuIT per hourBtuIT/h≈ 0.293 071 1(7), (8)
1 BtuIT per minuteBtuIT/min≈ 17.584 266(7), (8)
1 BtuIT per secondBtuIT/s≈ 1 055.056(7), (8)
1 Btuth per hourBtuth/h≈ 0.292 875 1(7), (9)
1 Btuth per minuteBtuth/min≈ 17.572 506(7), (9)
1 Btuth per secondBtuth/s≈ 1 054.350(7), (9)
1 calorieIT per hourcalIT/h≈ 0.001 163(8)
1 calorieIT per minutecalIT/min≈ 0.069 78(8)
1 calorieIT per secondcalIT/s≈ 4.186 8(8)
1 calorieth per hourcalth/h≈ 0.001 16(2)(9)
1 calorieth per minutecalth/min≈ 0.069 7(3)(9)
1 calorieth per secondcalth/s= 4.184(9)
1 ton of refrigeration ≈ 3 516.853(10)

Note:

(1) - 550 ft lbf/s;

(2) - termic;

(3) - electric;

(4) - metric;

(5) - imperial, UK;

(6) - hidraulic;

(7) - Btu - British thermal unit;

(8) - IT - common unit, international;

(9) - th - thermochemical unit;

(10) - 12 000 BtuIT/h.

 


See other pages:

thermodynamics: thermal flux