2. What is the SI unit of energy?

The SI unit of energy is the joule (J), named after the 19th-century physicist James Prescott Joule, who studied the relationship between heat and mechanical work. One joule is equivalent to the energy transferred when one newton of force moves an object one meter. So every time you kick a ball or light a spark, think of the joules at play! Energy is everywhere in our daily lives, from powering our homes to fueling our cars. In practical terms, you might find food energy measured in kilojoules (kJ) on nutrition labels, and your electronic devices might list their power consumption in watt-hours, where one watt is one joule per second. Understanding joules can help us appreciate the energy we consume and how we use it effectively!