power is the product of voltage and current.so we can measure the value of power just by using ammeter and voltmeter.......then why do we use a wattmeter?

5 Answers  

---

what is a difference b/w earthing & neutral?

5 Answers   ABB, KEC, Sterlite,

---

How to differentiate 220 Kv & 132 Kv line transmission tower if there are no specifications given on towers?

3 Answers   Karam, Power Grid,

---

what will happen if secondary of potential transformer (220kv/110volt) of any metering core or protection core (cables) of any phase got earthed??

1 Answers  

---

I have a reading off 1.5ohms at my mem my main c/b is rated at 40/6 amps in a domestic house and i was told to change it to a b curve c/b is this ok

0 Answers  

---

what is meant by vector group in transformers? wy we r using that?

1 Answers  

---

Is there any problem ,if R-Y-B voltage is constant , but the air compressor taking one phase high current.what is possible causes.the said compressor is very new.(55kw).

4 Answers  

---

why DG,Transformer,UPS capacity will be tell in KVA but not in KW?

4 Answers   Godrej,

---

how to calculate cable size with respect kw

0 Answers   SPMI,

---

How to calculate the External Resistance required for 60HP slipring motor in case no any data of the Motor is available???

0 Answers  

---

what is power ratio between star & delta connection of 3 phase induction motor

1 Answers  

---

Explain types soft starters?

7 Answers   Siemens, TCS,

---