A

To determine which statement is correct, we need to analyze the relationships between the units of measurement.

Step 1: Understanding the Joule
Joule (J) is the SI unit of energy, which can be expressed in terms of other units.

Step 2: Analyzing Option A
The relationship states that 1 Joule = 1 Coulomb × 1 Volt. This is derived from the definition of electric potential energy, where voltage (V) is defined as energy per unit charge. Therefore, energy (in Joules) can be expressed as:
$$Energy (J) = Charge (C) \times Voltage (V)$$
This makes Option A correct.

Step 3: Verifying Other Options
- Option B (Joule = coulomb/volt): This is incorrect as it incorrectly represents energy as a division.
- Option C (Joule = volt × ampere): Correctly states that 1 Joule = 1 Volt × 1 Ampere × 1 second (since Power = V × I, where Power in watts is also J/s), but does not directly represent Joules proper.
- Option D (Joule = volt/ampere): This is incorrect as it represents a ratio that does not define energy.

Therefore, the most directly correct statement regarding Joules is found in Option A.