A 1000 W kettle is used for 2 minutes. What is the energy consumed in kilojoules?

Get ready for the NCEA Level 1 Energy Test. Utilize flashcards and multiple choice questions with clear explanations and hints. Prepare for success!

Multiple Choice

A 1000 W kettle is used for 2 minutes. What is the energy consumed in kilojoules?

Energy used equals power multiplied by time. The kettle runs at 1000 watts for 2 minutes. Convert time to seconds: 2 minutes is 120 seconds. So energy = 1000 W × 120 s = 120,000 J, which is 120 kJ after dividing by 1000. The other options come from using an incorrect time (for example, 60 seconds would give 60 kJ) or mixing up units, since watts are joules per second and must be paired with seconds to get joules, then converted to kilojoules.

Energy used equals power multiplied by time. The kettle runs at 1000 watts for 2 minutes. Convert time to seconds: 2 minutes is 120 seconds. So energy = 1000 W × 120 s = 120,000 J, which is 120 kJ after dividing by 1000. The other options come from using an incorrect time (for example, 60 seconds would give 60 kJ) or mixing up units, since watts are joules per second and must be paired with seconds to get joules, then converted to kilojoules.

More practice questions