Power is an important idea in science. It helps us understand how fast energy moves or changes.

To measure power, we use a unit called the watt (W).

One watt is equal to one joule of energy used in one second. This means:
1 W = 1 J/s.

Main Formulas for Power:

1. Basic Power Formula:
   P = E / t
   Here:

   • P is power,
   • E is energy in joules,
   • t is time in seconds.

   For example, if you use 100 joules of energy in 5 seconds, your power would be:
   P = 100 J / 5 s = 20 W.

2. Mechanical Power:
   P = F × v
   In this formula:

   • F stands for force in newtons,
   • v is speed in meters per second.

   For instance, if a force of 10 newtons moves something at a speed of 2 meters per second, the power would be:
   P = 10 N × 2 m/s = 20 W.

Everyday Examples:

• Your microwave uses power to turn electrical energy into heat.
• A car's engine uses power to figure out how fast it can go, like speeding up.

By understanding these units and formulas, we can see how power affects many parts of our lives!