Power

Imagine you have two light bulbs: one is 20 watts, and the other is 80 watts.

When you turn them on, the 80-watt bulb glows much brighter than the 20-watt bulb. But why does this happen?

The difference lies in power, which tells us how much work the bulb does every second.

More power means the bulb does more work per second, making it shine brighter.

There is a simple way to calculate power: power equals work divided by time.

Power is measured in watts. One watt means that one joule of work is done each second.

Since the 80-watt bulb does more work every second than the 20-watt bulb, it glows brighter.

Now, think about other devices at home. A hairdryer or an electric heater has high power because they need to generate heat quickly.

You can find power labels on household appliances. For example, a bulb labeled 60 watts means it consumes 60 watts of power every second.

Take a look around your home and check how much power different appliances use.