The diagram shows the reading on an analogue ammeter. Which digital ammeter reading is the same as the reading on the analogue ammeter?

Question 6

The diagram shows the reading on an analogue ammeter.

Which digital ammeter reading is the same as the reading on the analogue ammeter?

display units                display reading

A                μA                        1600

B                μA                        160

C                mA                       16.0

D                 A                          1.60

Reference: Past Exam Paper – November 2014 Paper 11 & 12 Q3

Solution:

Answer: A.

This question is on the conversion of units.

Reading on analogue ammeter = 1.6 mA = 1.6 × 10^-3 A

1 μA = 10^-6 A

So, 1 A = 10⁶ uA

So, digital ammeter reading = 1.6 × 10^-3 A = 1.6 × 10^-3 × 10⁶ μA 

Digital ammeter reading= 1.6 × 10³ μA = 1600 μA