Which is a better conductor of electricity, metal or water? A B There is no difference.
Which is better to use to put out a fire? A B There is no difference.
The Correct Answer and Explanation is:
Question 1: Which is a better conductor of electricity, metal or water?
Correct Answer: A — Metal
Explanation:
Metals are significantly better conductors of electricity than water. This is due to their atomic structure. In metals, atoms are arranged in a lattice that allows electrons to move freely. These “free electrons” or “delocalized electrons” are responsible for carrying electric current with minimal resistance. This high electron mobility makes metals such as copper, silver, and aluminum excellent conductors.
Water, in contrast, is not a good conductor in its pure form. Pure (distilled) water is actually an insulator because it lacks free ions or charged particles. However, impure water, like tap water or saltwater, can conduct electricity because it contains dissolved ions such as sodium (Na⁺), chloride (Cl⁻), calcium (Ca²⁺), etc. These ions can carry electrical current, but not as efficiently as free electrons in metals.
In summary, metals are far superior to water in conducting electricity due to their electron mobility. That’s why electrical wiring is made of metals and not water-based substances.
Question 2: Which is better to use to put out a fire?
Correct Answer: B — Water
Explanation:
Water is generally better for putting out most types of fires, particularly Class A fires (fires involving ordinary combustibles such as wood, paper, and cloth). Water helps extinguish flames primarily through two mechanisms:
- Cooling Effect: Water absorbs heat from the fire, lowering the temperature below the combustion point.
- Smothering Effect: When water turns to steam, it displaces oxygen, reducing the availability of oxygen that fuels the fire.
However, caution must be taken — water is not suitable for all types of fires. It should not be used on:
- Electrical fires (Class C) — Water conducts electricity and can cause electrocution.
- Grease or oil fires (Class K or B) — Water can cause the burning oil to splatter, spreading the fire.
In conclusion, while water is an effective and common fire suppressant, its use depends on the type of fire.
