Answer:
Apply Ohm’s Law:
U = R x I
Rearranging for R:
R= U / I = 12 / 0.25 = 48 Ohms.
Note that the specification is for maximum operating parameters. Do not increase over them (specially current) or you may damage your bulb.
Was forgetting to calculate the power:
P = U x I = 12 x 0.25 = 3 Watts.
Note: you can remember the equations for Ohm’s Law and Power from voltage and current respectively as Uri and Pui.
Explanation:
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