Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

The electric power consumed by a device may be calculated by using either of the two expressions P = I2R or P = V 2/R . The first expression indicates that it is directly proportional to R whereas the second expression indicates inverse proportionality. How can the seemingly different dependence of P on R in these expressions be explained.

The electric power consumed by a device may be calculated by using either of
the two expressions P = I2R or P = V 2/R . The first expression indicates that it is
directly proportional to R whereas the second expression indicates inverse
proportionality. How can the seemingly different dependence of P on R in these
expressions be explained.

Grade:

1 Answers

aditya suman
39 Points
10 years ago

The expression P=I2R IS USED ONLY WHEN RESISTANCES ARE CONNECTED IN SERIES BECAUSE IN SERIES COMBINATION CURRENT IN EACH RESISTANCE IS CONSTANT

FOR EXAMPLE : IF R & R' ARE CONNECTED IN SERIES & I CURRENT IS PASSING THROUGH BOTH OF THEM THEN TOTAL POWER P=I2R+I2R'

P=P+P' THIS IS THE EXPRESSION FOR POWER WHEN RESISTANCES ARE CONNECTED IN SERIES

SIMILARLY WHEN RESISTANCES ARE CONNECTED IN PARALLEL THEN POWER BECOMES INVERSELY PROPORTIONAL TO R BECAUSE VOLTAGE IS CONSTANT IN THIS CASE

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free