Final answer:
To calculate the current supplied by the battery when the total power is 150W, assuming a 12V battery, the current is found using the formula I = P/V, resulting in I = 150W / 12V = 12.5A.
Step-by-step explanation:
To calculate the current supplied by the battery when both lamps are on and the total power supplied is 150W, we need to use the power formula P = IV, where P is the power in watts, I is the current in amperes, and V is the voltage in volts. Since the voltage is not provided in the question, we will assume it to be 12V, which is a common voltage for car batteries. Using the formula, we can rearrange it to solve for I: I = P/V. Thus, the current supplied by the battery is I = 150W / 12V = 12.5A. Note that the current in lamp L2 is 5A, so there may be an additional lamp or other factors involved to total up to the 12.5A supplied by the battery.