Question: what is the si unit for power which equals joules per second
[{'answer': 'watt', 'provenance': [{'wikipedia_id': '21347693', 'title': 'Watt', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]