Question

Please find the answer

Answer 1

least count is 0.15 V

reading of voltmeter is 1.8 V

I=V/R

I=1.8/20

I=0.9/10

I=0.09 A

hope this helps

Answer 2

Least count is the minimum value which an instrument can show                          so the least count is 1.5 minus 0 devided by number of division so it. 0.15