Question -
Answer -
(a) I2R
(b) IR2
(c) VI
(d) V2/R
Solution:
Answer: b) IR2
Explanation:
Electrical power is given by the expression P = VI. (1)
According to Ohm’s law,
V = IR
Substituting the value of V in (1), we get
P = (IR) × I
P = I2R
Similarly, from Ohm’s law,
I = V/R
Substituting the value of I in (1), we get
P = V × V/R = V2/R
From this, it is clear that the equation IR2 does not represent electrical power in a circuit.