Question

# A bread toaster and a bulb are connected parallel in a circuit. The toaster produces more heat than the bulb. Which of the following statements is true?

A
Resistance of toaster is greater than resistance of bulb
B
Resistance of bulb is same as the resistance of toaster
C
Resistance of bulb is greater than resistance of toaster
D
Cannot predict

Solution

## The correct option is A Resistance of bulb is greater than resistance of toasterSince the bread toaster and the bulb are connected in parallel, voltage is same across each of them.$$V_{toaster} = V_{bulb} ........(i)$$It is given that toaster produces more heat than the bulb.$$\implies P_{toaster} > P_{bulb}$$Using Joule's Law of heating for electrical resistance,$$\cfrac{V_{toaster}^2}{R_{toaster}} > \cfrac{V_{bulb}^2}{R_{bulb}} ........(ii)$$From (i) & (ii),$$R_{bulb} > R_{toaster}$$Hence, resistance of bulb is greater than that of the toaster.Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More