Question

Resistors of 500 ohm and 3000ohm are placed in
series with a 60 V supply. What will be the
reading on a voltmeter of internal resistance
2000ohm,when placed across
(a) the 500ohm resistor
(b) the 3000ohm resistor?​

Answer 1

Explanation:

a) so equivalent resistance=(500P2000)

=400 ohms

we know, in series, V is distributed in direct ratio of resitances

so, V500 : V3000 = 400:3000

=2:15

so, V in 500 ohm=2/(2+15)*60

=120/17 volts

b) so equivalent resistance =500S(3000P2000)

=500+1200

=1700 ohms

we know, in series, V is distributed in direct ratio of resitances

so, V500 : V3000 = 500:1700

=5:17

so, V in 3000 ohms=5/(5+17)*60

=300/22 volts