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Two 1.50-V batteries—with their positive terminals in the same direction—are inserted in series into a flashlight. One battery has an internal resistance of 0.255 Ω, and the other has an internal resistance of 0.153 Ω. When the switch is closed, the bulb carries a current of 600 mA. (a) What is the bulb's resistance? (b) What fraction of the chemical energy transformed appears as internal energy in the batteries? 

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Manoj Pandey
Manoj PandeyLv10
26 Nov 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A power supply has an open-circuit voltage of 40.0 V and an internal resistance of 2.00 Ω. It is used to charge two storage batteries connected in series, each having an emf of 6.00 V and internal resistance of 0.300 Ω. If the charging current is to be 4.00 A,
(a) what additional resistance should be added in series?
At what rate does the internal energy increase in
(b) the supply,
(c) in the batteries, and
(d) in the added series resistance?
(e) At what rate does the chemical energy increase in the batteries?
 

A power supply has an open-circuit voltage of 40.0 V and internal resistance of 2.00 Ω. It is used to charge two storage batteries connected in series, each having an emf of 6.00V and internal resistance of 0.300 Ω. If charging current is to be 4.00A, (a) What additional resistance should be added in series. At what rate does the internal energy increase in (b) the supply, (c) in the batteries, and (d) in the added series resistance? (e) At what rate does the chemical increase in the batteries?

A real battery is not just an emf, we can model a real 1.5V battery as a 1.5 V emf in series with a resistor known as the internal resistance. A typical battery has 1.0 Ω internal resistance due to imperfections that limit the current through the battery. When there's no current through the battery, and thus no voltage drop across the internal resistance, the potential difference between its terminals is 1.5 V, the value of the emf. Suppose the terminals of this battery are connected to a 3 Ω resistor.

what fraction of the battery's power is dissipated by the internal resistance?

 

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