To find out how much energy a light bulb uses in a given time, you multiply watts by what?

To determine how much energy a light bulb uses over a specific period, multiplying the wattage by time is essential. Watts already represent a measure of power, equivalent to joules per second. Therefore, when you multiply watts (which tell you how much energy is used per second) by the time (in seconds) that the bulb is on, you will arrive at the total energy consumed in joules or watt-hours. This approach aligns with the basic formula for calculating energy consumption, which is Energy (in joules or watt-hours) = Power (in watts) × Time (in hours).

The other options do not pertain directly to calculating energy usage over time. Amperes measure current, voltage measures electrical potential, and ohms measure resistance, but none of these directly address the energy consumption of the bulb when considered over time.