how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?

1 Answers   ONGC,

---

why we changed the polarity of DC generator ?

1 Answers   DMRC, Microsoft,

---

how to determine the inrush current of a transformer

0 Answers  

---

how can i change the rotation of the AC single phase induction motor and show me by diagram

0 Answers  

---

Why there is restriction to generated voltage to certain limit for example (now 18kv) ?

3 Answers   College School Exams Tests,

---

why the India electrical supply transmission loss is high when compare to us

0 Answers  

---

how u calculate ups battery backup

2 Answers  

---

why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer.

12 Answers   ABB, Adani, Central Electricals, Electrical, HCL,

---

Do closed loops systems require manual input?

0 Answers   Ericsson,

---

power transmission pole used one support , that only for support or earthing

0 Answers  

---

What is plc and how to do preventive maintenance

1 Answers  

---

In a 132KV Grid Station where voltage level is 132KV, here,  why the rating of Surge arrests installed 120KV ? 

1 Answers  

---