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Expected Responses:
- The electric lamp gave the best light.
- Electricity is the cleanest source of light.
- The candle burns, in the presence of oxygen, by vaporizing the wax
and burning the gasses. This is similar to what happens when a match
burns; the process of combustion is the same but the fuel is
different.
- Again the process is similar; the kerosene is vaporized and the gasses
burn. The kerosene rises through the wick by capillary
action.
- The chemical element is carbon.
- The light bulb glows because of the electrical resistance of the
filament. There is no fuel burning inside the bulb.
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