Understanding the Relationship: Quantity and Unit

The question asks us to find a word-pair that shares a similar relationship to the given pair: Energy : Joule.

Let's analyze the relationship in the original pair:

• Energy is a physical quantity.
• Joule is the standard unit of measurement for energy in the International System of Units (SI units).

So, the relationship in the pair Energy : Joule is Quantity : Standard Unit of Measurement.

Analyzing the Options

Now, let's examine each option to see which one exhibits the same Quantity : Standard Unit of Measurement relationship.

Option 1: Temperature : Hot

• Temperature is a physical quantity.
• Hot is a descriptive state or quality associated with temperature, not a unit of measurement. Units for temperature include Celsius, Fahrenheit, or Kelvin.

The relationship here is Quantity : Descriptive State. This is different from Quantity : Unit of Measurement.

Option 2: Force : Watt

• Force is a physical quantity.
• Watt is the standard unit of measurement for Power, not Force. The standard unit for Force is Newton.

The relationship here is Quantity : Incorrect Unit. This is different from Quantity : Unit of Measurement.

Option 3: Power : Horse

• Power is a physical quantity.
• Horse (as in horsepower) is a unit of measurement for Power, but it is not the standard SI unit. The standard SI unit for Power is Watt.

The relationship here is Quantity : Unit (Non-SI). While it is a unit, it's not the standard SI unit like Joule is for Energy.

Option 4: Current : Ampere

• Current (specifically Electric Current) is a physical quantity.
• Ampere is the standard unit of measurement for Electric Current in the International System of Units (SI units).

The relationship here is Quantity : Standard Unit of Measurement.

Comparison and Conclusion

Comparing the relationship in the original pair Energy : Joule (Quantity : Standard Unit of Measurement) with the relationships in the options, we find that the pair Current : Ampere has the identical relationship.

Therefore, the word-pair that best represents a similar relationship to Energy : Joule is Current : Ampere.

Revision Table: Common Quantities and SI Units

Additional Information: Understanding SI Units

The International System of Units (SI) is the modern form of the metric system and is the most widely used system of measurement. It is based on seven base units, from which other derived units are formed. Using standard units like the Joule for energy or the Ampere for current ensures consistency and clarity in scientific and everyday contexts.

Analogy questions often test your understanding of fundamental relationships between concepts. In this case, knowing common physical quantities and their standard units was key to solving the problem.