Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • An AC ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the AC ammeter reads 3 ampere. When another alternating current passes through the cir

An AC ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the AC ammeter reads 3 ampere. When another alternating current passes through the circuit, the AC ammeter reads 4 ampere. Then the reading of this ammeter if DC and AC flow through the circuit simultaneously, is -

Option: 1

3 amper


Option: 2

1 amper


Option: 3

7 amper


Option: 4

5 amper


Answers (1)

best_answer

Quantity of heat liberated in the ammeter of resistance R

(i) due to direct current of 3 ampere \mathrm{=[(3) 2 \mathrm{R} / \mathrm{J}]}

(ii) due to alternating current of 4 ampere \mathrm{=\left[(4)^2 R / J\right]}

Total heat produced per second \mathrm{=\frac{(3)^2 R}{J}+\frac{(4)^2 R}{J}=\frac{25 R}{J}}

Let the equivalent alternating current be I ampere; then \mathrm{\frac{\mathrm{I}^2 \mathrm{R}}{\mathrm{J}}=\frac{25 \mathrm{R}}{\mathrm{J}}} or I = 5 amp

 

Posted by

Ritika Harsh

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2026 application correction begins on jeemain.nta.nic.in; edit details by December 2
anam-khan

JEE Mains 2026 LIVE: NTA to conduct session 1 from January 21 to 30; exam pattern, syllabus
anam-khan

JEE Main 2026 correction window opens tomorrow; NTA allows exam city change

Latest Question