A bulb is a small, rounded object that usually gives off light when electricity passes through it. In everyday English, the word can also mean any light-producing part of a lamp, the glass part of a flashlight, or the tiny glass globe in your ceiling light.
People talk about bulbs when a room goes dark—“The bulb blew out, I need a new one.” They compare them in shops—“This LED bulb lasts longer and uses less power.” Kids screw bulbs into science kits, and homeowners swap old ones for smart bulbs they can control with their phone.
Meaning & Usage Examples
- Light bulb: “Can you hand me a 60-watt bulb?”
- Plant bulb (like tulip or onion): “Plant the bulb 5 cm deep in fall.”
- Smart bulb: “Tell Alexa to dim the bulb to 30 %.”
What is the difference between a bulb and an LED?
A bulb is the glass part that gives light; an LED is the tiny chip inside many modern bulbs that makes the light. You can buy an LED bulb, but not all bulbs are LEDs.
How do I know which bulb to buy?
Check the fitting (e.g., E27, GU10), the brightness (lumens), and the color (warm or cool). Match these to the old bulb or the lamp label.
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