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bonjour
4h11 min
1h⇒3600 secondes
4x3600=14400s
1min⇒60 secondes
11x60=660s
4h11⇒14400+660=15060s
950x15060=14 307 000Joules
1kwh⇒3 600 000J
14307000/3600000≈3.97x10⁹kwh
5min 30s=(5x60)+30=330s
265x330=87450Joules
87450/3600000≈0.024x10⁻¹¹⇒2.4x10⁻²kwh