Question

12th class physics An ideal ammeter (zero resistance) and an ideal voltmeter (infinite resistance) are connected as shown. The ammeter and voltmeter readings are
6.25 A, 3.75 V
3.00 A, 5 V
3.00 A, 3.75 V
6.00 A, 6.25 V

Answer 1

Answer:

Explanation:

An ideal ammeter (zero resistance) and an ideal voltmeter (infinite resistance) are connected as shown in fig. The ammeter and the voltmeter readings are

question

December 20, 2019avatar

Shafaque Saksena

ANSWER

From given figure the equivalent resistance R of the combination is

R=(  

5+15

5×15

​  

+1.25)

R=  

20

75

​  

+1.25

R=3.75+1.25

∴R=5Ω

Hence the current I through the circuit is

I=  

5

20

​  

A=4A

Now, current through 5Ω resistance is

20

15

​  

×4=3A

Also reading of voltmeter V  

r

​  

(say) is equal to the potential drop across 1.25Ω resistance

V  

r

​  

=4×1.25V=5V