An ammeter of resistance 5 has a full-scale def... - JAMB Physics 2006 Question
An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?
A
0.25Ω
B
5.00Ω
C
19.80Ω
D
0.05Ω
correct option: d
R = (igrg)/I-ig = (50 x 10-3 x 5)/5-(50 x 10-3) = (0.25)/4.95 = 0.0505 = 0.05Ω
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