Skip to main content

Q.The resistance of a resistor is reduced to half of its initial value. Indoing so, if other parameters of the circuit remain unchanged, theheating effects in the resistor will become?

(A)

two times.

(B)

half.

(C)

one-fourth.

(D)

four times.​


Ans:- Given Resistance is reduced to half, so resistance = R/2

Also given that, other parameters of circuits remain unchanged,

For constant Current, heating effect of resister will become - 


• This means that Heat is directly proportional to resistance, so when resistance is halfed, then heat effect will also become halfed

For the constant Voltage, heating effect of resistor become - 

• This means that Heat is indirectly proportional to resistance, so when resistance is halfed, then heat effect will also become doubled

So, we found that there are 2 cases, current being constant and voltage being constant. 

Note - Both cases have different answer!

Comment if doubt







Comments

Post a Comment

Pls Do Not Spam In The Comment Box !

Popular posts from this blog

i. Annie writes that it was fortunate that Mr. Keesing took the joke the right way. Why does she feel so? 3 Marks

 Annie writes that it was very fortunate that Mr Kessing took the joke the right way, this is because - One cannot expect a teacher to take a joke in a right way from a child, unlike he has taken Anne's. Annie thought of playing a joke on Mr Kessing. But he love the way Annie presented the poem. It was about a mother duck and a father swan with three baby ducklings who were bitten to death by the father because they quack too much. Mr Kessing took the joke right way and also read the poem to the class, adding his own comments and to several classes as well. Now Annie was allowed to talk and haven't been assigned any extra homework.
Post a Comment
Read more

iii. Justify the poet’s allusion to Rapunzel in ‘Amanda’.

In the poem 'Amanda', the poet Robin Klein speaks about Rupanzel, a fairy who lived in a tall tower. She has bright hairs. She do not care for anything. Her life was tranquil and peaceful.  As such, Amanda also imagines a life like Rupanzel, living in a huge tower. She feel that, in the tall tower, she can do everything without being nagged from her mother. She also says that she will never let her hair down like Rupanzel. This means that, she doesn't allow anyone to come in the tower and wants to live alone and free.
Post a Comment
Read more

Assertion (A): Different people have different development goals. Reason ®: People want freedom, equality, security and respect

  Options: a. Both A and R are true and R is the correct explanation of A. b. Both A and R are true but R is not the correct explanation of A. c. A is true but R is false. d. A is false but R is true. Correct Answer : a. Both A and R are true and R is the correct explanation of A.
Post a Comment
Read more