A Levels Physics (9702)•9702/13/M/J/19
Explanation
Unit Conversion for Electric Current
Steps:
- Identify the analogue ammeter scale, assuming it points to 1.6 on a milliampere (mA) range.
- Convert mA to microamperes (µA) using the factor: 1 mA = 1000 µA.
- Calculate: 1.6 mA × 1000 = 1600 µA.
- Match this value to the digital options.
Why A is correct:
- 1600 µA equals 1.6 mA exactly, matching the analogue reading via the standard prefix conversion (1 mA = 10³ µA).
Why the others are wrong:
- B: 16.0 mA equals 16,000 µA, ten times larger than 1.6 mA.
- C: 16.0 mA equals 16,000 µA, ten times larger than 1.6 mA.
- D: 1.60 A equals 1,600,000 µA (since 1 A = 10⁶ µA), 1000 times larger than 1.6 mA.
Final answer: A
Topic: Electric current
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