A Car's Energy Efficiency?

📌 CONCEPT: Power is the rate at which energy is consumed or produced, and it is calculated as the ratio of energy to time.

📐 RULE / FORMULA: The formula for power consumption is P = E / t, where P is power, E is energy, and t is time.

💡 WORKED EXAMPLE: A car travels from point A to point B using 120 kJ of energy in 20 minutes. We can calculate its power consumption using the formula: P = 120 kJ / (20 minutes * 60 s/min) = 120 kJ / 1200 s = 0.1 kW.

⚠️ COMMON MISTAKE: Students often forget to convert the time from minutes to seconds when calculating power consumption.