Question

Express the power of a 100 watt bulb in CGS unit. Easy method

Answer 1

We know POWER = energy/time
watt = jule /sec

in C.gs system 1 jule = 10^7 erg

hence,
100watt = 100 jule/s = 100 × 10^7 erg/s

= 10^9 erg/s