Final answer:
A 100 watt electric bulb used for five hours consumes 500 watt-hours, or 1,800,000 joules of energy, calculated by multiplying the power (100 watts) by the time (5 hours) and converting the result to joules using the conversion factor of 3600 J/watt-hour.
Step-by-step explanation:
To calculate the amount of energy consumed by a 100 watt electric bulb used for five hours, we use the formula for electrical energy, which is E = Pt where E is the energy in watt-hours, P is the power in watts, and t is the time in hours. In this case, since the power is 100 watts and the time is 5 hours, the energy E will be:
E = P × t = 100 watts × 5 hours = 500 watt-hours
Since 1 watt-hour equals 3600 joules (J), the energy in joules would be:
E = 500 watt-hours × 3600 J/watt-hour = 1,800,000 J
Therefore, the 100 watt electric bulb used for five hours consumes 500 watt-hours or 1,800,000 joules of energy.