A certain battery has a 12.0-V emf and an internal resistance of 0.100 . (a) Calculate its

A certain battery has a 12.0-V emf and an internal resistance of 0.100 Ω.

(a) Calculate its terminal voltage when connected to a 10.0-Ω load.

(b) What is the terminal voltage when connected to a 0.500-Ω load?

(c) What power does the 0.500-Ω load dissipate?

(d) If the internal resistance grows to 0.500 Ω, find the current, terminal voltage, and power dissipated by a 0.500-Ω load.

Strategy

The analysis above gave an expression for current when internal resistance is taken into account. Once the current is found, the terminal voltage can be calculated using the equation V = emf- Ir. Once current is found, the power dissipated by a resistor can also be found.