PHYS345 Electricity and Electronics

Quiz 1

Consider the following circuit that represents a small penlight, one alkaline AAA cell connected to a lamp. The AAA cell provides an emf of 1.5 V and has an internal resistance r of 0.6 ohms. The lamp resistance R is 7.0 ohms under normal operating conditions.

  1. What is the current in the circuit?

  2. What power is dissipated by the lamp?

  3. What is the terminal voltage of the AAA cell?
Simple lamp circuit

Last updated Sept. 9, 1998.
Copyright George Watson, Univ. of Delaware, 1998.