Answer:
Given,
Resistance (R cold) = 2 Ohm
Current (I) = 0.4 Ampere
Voltage (V) = 4V
Let us calculate the resistance when it is glowing by using Ohm’s law.
According to Ohm’s law,
V = I x R
\(R = \frac{V}{I}\)Substituting the values in the above equation, we get
R = 4/0.4
R = 10 Ohm