A group of MRU students wants to study the effect of the small electric pulse generators in reducing blood pressure. After preparing the self-powered generators, the students test them on groups of rats with small blood pressure devices on their back. One group of rats wear the generators with the electrical current on, while the other group wear the same generators but with the electrical current off. In this experiment:

1. What is the experimental group?

2. What is the control group?

3. What is the control variable in this experiment?

4. What is the dependent and independent variable?