Derive an expression for electric energy consumed ina device in terms of V, I and t where v is the potential difference applied to it, I is the current drawn by it and t is the time for which the current flows????? Plz help me out wid diz!!!!!
Asked by Yamini Hosangadi
| 16th May, 2014,
05:56: PM
Expert Answer:
Energy is given as product of power and time.
E = Pt
Hence, electrical energy consumed will be electrical power multiplied by time.
Now, electrical power consumed by a device is given as product of voltage and current.
P = VI
Hence, the electrical energy consumed in time t is,
E = Pt = VIt
Answered by Romal Bhansali
| 19th May, 2014,
11:12: AM
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Why can't I use P=VI here, and how can I determine when to use P=VI or P=I^2 R or P=V^2 / R
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