In Fig.`6.61` the voltmetre and ammeter shows are ideal. Then voltmeter and ammeter readings, respectively, are

Options

A. `125 V, 3A`
B. `100 V, 4 A`
C. `120 V, 4A`
D. `120 V, 3A`

Answer

B

Explanation

Resistors `20 Omega`, `100 Omega`, and
`25 Omega` will be in parallel.
Their equivalent is `10 Omega`.
`I = (200)/(5 + 10 + 5) = 10 A`
Potential difference across `10 Omega` is `10 I = 10 xx 10 = 100 V`
This will be the voltmeter reading. Also, this will be the potential difference across each of `20 Omega`, `100 Omega`, and `25 Pmega` resistors.
Ammetre reading = current through `25 Omega = (100)/(25) = 4A`