P = V I (1a) P = R I 2 (1b) P = V 2 / R (1c) where P = power (Watts) V = voltage (Volts)voltage I = current (Amperes) R = resistance (Ohms) - ppt download
Physics formula and data book
The voltage across a lamp is (6.0 ±0.1) V and the current flowing through it is (4.0 ±0.2) A. Find the power consumed with maximum permissible error in it.
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P = VI P = I2R
Ohms Law Tutorial and Power in Electrical Circuits
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