Which of the above pairs are correctly matched?

Question

Consider the following pairs.

A. Power — Watts

B. Current — Volt

C. Frequency — Hertz

D. Resistance — Ampere

Which of the above pairs are correctly matched?

1. A. A and B
2. B. A and C (Correct answer)
3. C. A, C and D
4. D. A and D

Correct Answer

Option B — A and C

Detailed Solution & Explanation

The correct answer is A and C.

Key Points

• Power is measured in Watts ✓.
• Frequency is measured in Hertz ✓.
• Current is measured in Ampere (not Volt).
• Resistance is measured in Ohm (not Ampere).
• A and C are correctly matched.

Additional Information

• The SI units to keep paired: power → watt, current → ampere, potential difference → volt, resistance → ohm, frequency → hertz, charge → coulomb, energy → joule.
• Ohm's law links three of them: V = IR, so one volt drives one ampere through one ohm.
• Power can be written P = VI = I²R = V²/R, which is why a watt equals a volt-ampere.
• One hertz is one cycle per second; India's mains supply is 50 Hz at 230 V.