A 6.0 V battery has an internal resistance r. The measured voltage (emf of the battery) is 6.0 V. When connected to a resistor R the terminal voltage is 5.9 V and the current is 0.18 A.(adsbygoogle = window.adsbygoogle || []).push({});

I managed to get a) What is the internal resistance r of the battery?

0.556 ohm

as well as b) What is the value of the external resistor R?

32.78 ohm

but i cant figure out what to do when they ask me

c) What is the energy dissipated inside the battery in 4.4 minutes?

and d)When a second identical battery is added in series and the external resistor is R = 29 Ohms what is the resulting current?

Please help me. I have been trying this for an hour!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Batteries and Internal resistance

**Physics Forums | Science Articles, Homework Help, Discussion**