Question

convert 1 Joule to erg

Answer 1

1J = 1N * 1m
= 10^5 dynes * 100cm
= 10^7 dynes cm
or
= 10^7 ergs

Answer 2

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convert 1 Joule to erg.

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Unit of energy is joule = kg*m²/s²

Joule is a MKS unit and erg is a CGS unit

MKS = CGS

1 m = 100 cm

1 s = 1 s

1 kg = 1000 gm

From above :

1 joule = 1 kg*m²/s²

= 1000 * 10000 / 1 cm*m²/s²

= 10^7 gm*cm²/s²

= 10^7 erg

So, 1 joule = 10^7 erg