Answer:
Sunlight
Explanation:
Sunlight is not provided 24 hours a day so during nightfall solar panels will not have the ability to collect energy.
Net energy is the amount of that is actually useable from an energy resource. Net-energy ratio is the ratio of the amount of useable energy from a resource and the amount it takes to make that energy useful. ... An energy source with high energy efficiency provides a lot of work for the amount of energy used.
