By the time mains electricity reaches your home, more than 10 per cent of the power that was fed into the grid by the generating station has been wasted as heat, produced by the electrical resistance in the transmission cables.

• 但是在发电厂产生的电流通过电力网输送到你家之前，由于电缆有电阻，已经有超过10%25的电能转化为热能损失掉了。