True or false: internal resistance

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   A real source has an internal resistance r.

2. Statement is true

   Yes

   Statement

   The voltage across the external resistance is ε R ÷ (R + r).

3. Statement is true

   No

   Statement

   Terminal voltage equals the emf when current is flowing.

4. Statement is true

   Yes

   Statement

   A larger internal resistance lowers the terminal voltage.

5. Statement is true

   Yes

   Statement

   In an open circuit the terminal voltage equals the emf.

Explanation