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Where do light bulbs get their energy from?(1 point)
a conductor
light
an energy source
heat
Explain how light bulbs create light.(1 point)

Electricity flows through an insulator that absorbs electrical energy, transfers it to the light bulb, and converts it to heat and light.

Electricity flows through a voltage that converts electrical energy into light.

Electricity flows through a conductor that absorbs heat and turns the heat into light energy.

Electricity flows through a conductor that transfers the energy to the light bulb and the light bulb converts it to heat and light.

List three things that use light energy, and explain how they use it.(4 points)

If a metal object and a plastic object are both at the same cold temperature and you pick them up which one will feel colder in your hand? In one or two sentences, explain why.(2 points)

Sagot :

When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light.

Essentially, the lightbulb is a very thin filament of hard-to-melt metal – tungsten, usually – encased in a glass bulb filled with inert gases so that the filament doesn't oxidise and disintegrate. The electricity causes the wire to glow and a portion of that energy is turned into light.

Light energy can also be converted into thermal energy when for example the sun heats up your black shirt or a brick wall outside. There are many example we see in our routine life carrying light energy like lightened candle, flash light, fire, Electric bulb, kerosene lamp, stars and other luminous bodies etc.

Why does metal feel colder than plastic when both objects are the exact same room temperature?

It is because the metal conducted heat faster that it feels colder than the wood, which conducted heat slower. They feel different temperatures, but they are actually the same. ... If you stepped on the tiles, it would feel colder because they conduct heat faster.

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