1 joule = ?
1 Newton \(\times\) 1 metre
1 Newton × 1 metre is correct.
Work (and therefore energy) in the SI system is defined as force times the displacement in the direction of the force: \(W = F \cdot d\). One joule is the work done when a force of one newton acts on a body and displaces it one metre along the direction of the force.
Pascal is the SI unit of pressure, erg is the CGS unit of energy (\(1\ \text{J} = 10^{7}\ \text{erg}\)), and watt is the SI unit of power (joule per second), so none of them combines with a metre to give a joule.
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