Question

What will a voltmeter of resistance 200 Ω read when connected across a cell of emf 2 V and internal resistance 2 Ω?

Answer 1

Data: E = 2 V, r = 2 Ω, R = 200 Ω

The voltmeter reading, V = IR = `(E/(R +r))R`

= `(2/(200 + 2))200`

= `400/202`

= `200/101`

log 200 =     2.3010
log 101 =  − 2.0043
                    0.2967

AL (0.2967) = 1.980

= 1. 98 V