First slide

Electrical power

Question

A 10V, 1.5Ω cell is connected in series with a variable resistance R whose value can be varied from zero to 1Ω. If ‘R’ is made to gradually increase from zero to 10 Ω, power dissipated in R.

Moderate

A

remains constant at 125 walt
B

first increases and then decreases upto a minimum value
C

increases continuously upto a maximum value
D

first increases upto a certain value and then remains constant

Solution

Power consumed in the external circuit is maximum when R = internal resistance of the cell i.e. when R = 1.5 Ω. Initial power is zero and final power is ${(\frac{10}{10 + 1.5})}^{2} \times 10 wa t t$ .

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App