
Change in power supply, when two identical resistances are connected in series instead of one.

Answer to Problem 7Q
Solution:
The battery needs to supply only half the power.:
Explanation of Solution
Given:
Two identical resistor of resistance,
Battery
Formula used:
The power of the light bulb is given as
Here,
is the power
is the voltage
is the resistance of the bulb
Calculation:
The initial power supplied by the battery when there is only one resistance is connected
…… (1)
The total resistance of the circuit when two resistors connected in series connection
The power supplied by the battery when two resistors are connected in series is calculated as
…… (2)
It’s clear from the Eq. (1)and Eq. (2), that only half the power is required when two resistors are connected in series connection.
Chapter 19 Solutions
Physics: Principles with Applications
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