Question

If an ammeter have 2 displaying scales of 30A & 100A and you are selecting the range of ___ A, then what will be the value of current when the pointer is showing 70A in 100A scale?

Answer 1

Answer:

If an ammeter have 2 displaying scales of 30A & 100A and on selecting the range of 30 A, the value of current when the pointer is showing 70A in 100A scale will be 21 A

Explanation:

100 A     Displays  as   30 A

1 A  Displays as 30/100 = 0.3 A

70 A displays as = 70 * 0.3  = 21 A

If an ammeter have 2 displaying scales of 30A & 100A and on selecting the range of 30 A, the value of current when the pointer is showing 70A in 100A scale will be 21 A