Okay.
1. Zibo Jinjing Glass Factory is a large-scale group company whose main business is the development, production, processing and operation of glass, soda ash and their extended products, and gradually enters the fields of new solar materials and new energy-saving materials. It is a national high-tech enterprise and a key enterprise in China's new material base.
2. The products produced by Zibo Jinjing Glass Factory have been recognized by customers and have particularly attractive advantages.
Known: U quantity=12V? P quantity=30W=0.03kW? t0=10h? W light=7.5kW?h?
Find: (1) R =? (2)W0=? (3) η=?
Solution:
(1)∵P=
| R |
The resistance of the lamp post is R=
| U pillar 2 |
| Pillar P< /td> |
| (12V)2 |
| 30W |
(2)∵P=
| W |
| t |
∴The daily electricity consumption of street lights is of W0=Pt0=0.03kW×10h=0.3kW?h;
(3) The electricity consumed by the street lights in 5 days is W electricity=nW0=5×0.3kW? h=1.5kW?h
Solar panels convert light energy. in electrical energy The efficiency is η=
| W electricity |
| W light |
| 1 .5 kW?h |
| 7.5 kW?h |
(1) The resistance of the street lamp is 4.8Ω;
(2) The daily power consumption of the street lamp is 0.3 kW?h;<. /p >
(3) The efficiency of solar panels in converting light energy into electrical energy is 20%