# Express the power

Power = 100 W

Power is defined as the rate of dissipation of energy. Energy is expressed in Joules.

1 W = 1 Js-1

1 Joule is defined as the amount of energy exerted when a force of 1 N displaces an object by 1m.

1 J = 1 Nm

1 Newton of force can be converted into CGS units. The CGS equivalent is – 1 N = 105 dyne

1 meter is equal to 100 cm.

1 m = 100 cm

1 J = 1 Nm

= 105 dyne × 100 cm

= 107 dyne cm

1 W = 107 dyne cm/s

100 W = 100 × 107 dyne cm/s

= 109 dyne cm/s

1 dyne cm = 1 erg

1 erg = 10-7 J

So 100 W = 109 erg/s

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