How much current is required to deliver 120 watts at a voltage of 12 volts DC?

To solve this problem, you need to use the formula for electrical power, often referred to as Watt's Law. The formula is P = I × E, where P is power in watts, I is current in amperes, and E is voltage in volts. To find the current, you must rearrange the formula to solve for I. Dividing both sides by E gives you I = P / E. Plugging in the numbers provided in the question, you divide 120 watts by 12 volts. This calculation results in exactly 10 amperes. The other options result from applying the wrong mathematical operation, such as adding the numbers to get 132.