torque of 1 newton-metre applied on 1 radian requires exactly 1 newton-metre = 1 joule of energy. Other units of energy In cgs units, one erg is 1&nbsp; g &nbsp; cm 2 &nbsp; s &minus;2 , equal to 1.0&times;10 &minus;7 &nbsp;J. The imperial / U.S. units for both energy and work