Question

Which pair of readings of ideal voltmeter and ideal ammeter in the given circuit is possible when a suitable power source of 3 Ω internal resistance is connected between P and Q?

विकल्प

• 12.0 V, 2.0 V

• 2.0 V, 0.5 A

• 6.0 V, 2.0 A

• 12 V, 0.5 A

Answer 1

12 V, 0.5 A

Explanation:

`R_"internal"` = 3 Ω

`R_"external"` = 24 Ω

R = `R_"internal" + R_"external"`

= 3 + 24

= 27 Ω

The current in the circuit,

I = `V_"source"/27`

And, the voltage across 24 Ω resistance is:

V = l . 24

For l = 2.0 A,

V = 2 × 24

= 48 V

For l = 0.5 A,

V = 0.5 × 24

= 12 V

Hence, 12 V, 0.5 A values match perfectly for an ideal ammeter and an ideal voltmeter.