The head lamp bulb of a motor car is rated 60w ,12v, calculate the resistance of it's filament?

To calculate the resistance of the filament, we can use Ohm's Law which states that resistance (R) is equal to voltage (V) divided by current (I).

Given:
Power (P) = 60W
Voltage (V) = 12V

First, we need to calculate the current (I) using the formula:
P = V * I
60 = 12 * I
I = 60 / 12
I = 5A

Now, we can calculate the resistance (R) using the formula:
R = V / I
R = 12 / 5
R = 2.4 ohms

Therefore, the resistance of the filament in the head lamp bulb is 2.4 ohms.